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[Commits] 8e804c24b79: MDEV-26590: Stack smashing/buffer overflow in Histogram_json_hb::parse
by psergey 13 Sep '21

13 Sep '21

revision-id: 8e804c24b79d2e31138dcc6d9dc4ae3ea98bd948 (mariadb-10.6.1-130-g8e804c24b79) parent(s): 0fe2cfd45e616e93d47aa9e224db468f32dd391a author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-13 14:55:10 +0300 message: MDEV-26590: Stack smashing/buffer overflow in Histogram_json_hb::parse Provide buffer of sufficent size. --- mysql-test/main/statistics_json.test | 13 ++++++++++++- sql/opt_histogram_json.cc | 13 ++++++++----- 2 files changed, 20 insertions(+), 6 deletions(-) diff --git a/mysql-test/main/statistics_json.test b/mysql-test/main/statistics_json.test index f279296b7d5..ecaeddbb3e6 100644 --- a/mysql-test/main/statistics_json.test +++ b/mysql-test/main/statistics_json.test @@ -170,5 +170,16 @@ set histogram_size=10, histogram_type='json_hb'; analyze table t10 persistent for all; select histogram from mysql.column_stats where table_name='t10' and db_name=database(); - drop table t10; + +--echo # +--echo # MDEV-26590: Stack smashing/buffer overflow in Histogram_json_hb::parse upon UPDATE on table with long VARCHAR +--echo # + +CREATE TABLE t1 (b INT, a VARCHAR(3176)); +INSERT INTO t1 VALUES (1,'foo'),(2,'bar'); +SET histogram_type= JSON_HB; +ANALYZE TABLE t1 PERSISTENT FOR ALL; +SELECT * FROM t1; +drop table t1; + diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 979fca22a40..d4db1b95e53 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -272,6 +272,7 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, int obj1_len; double cumulative_size= 0.0; size_t end_member_index= (size_t)-1; + StringBuffer<128> value_buf; if (JSV_OBJECT != json_type(hist_data, hist_data + hist_data_len, &obj1, &obj1_len)) @@ -371,12 +372,13 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, } - uchar buf[MAX_KEY_LENGTH]; + //uchar buf[MAX_KEY_LENGTH]; uint len_to_copy= field->key_length(); field->store_text(val, val_len, &my_charset_bin); - uint bytes= field->get_key_image(buf, len_to_copy, Field::itRAW); + value_buf.alloc(field->pack_length()); + uint bytes= field->get_key_image((uchar*)value_buf.ptr(), len_to_copy, Field::itRAW); - buckets.push_back({std::string((char*)buf, bytes), cumulative_size, + buckets.push_back({std::string(value_buf.ptr(), bytes), cumulative_size, ndv_ll}); // Read the "end" field @@ -393,8 +395,9 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, if (ret != JSV_NOTHING) { field->store_text(end_val, end_val_len, &my_charset_bin); - uint bytes= field->get_key_image(buf, len_to_copy, Field::itRAW); - last_bucket_end_endp.assign((char*)buf, bytes); + value_buf.alloc(field->pack_length()); + uint bytes= field->get_key_image((uchar*)value_buf.ptr(), len_to_copy, Field::itRAW); + last_bucket_end_endp.assign(value_buf.ptr(), bytes); if (end_member_index == (size_t)-1) end_member_index= buckets.size(); }

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[Commits] 0fe2cfd45e6: Address review input
by psergey 11 Sep '21

11 Sep '21

revision-id: 0fe2cfd45e616e93d47aa9e224db468f32dd391a (mariadb-10.6.1-129-g0fe2cfd45e6) parent(s): 5cbab7b371bd4a10eb6f8fd3e7d90339cc5653e3 author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-11 19:43:08 +0300 message: Address review input --- mysql-test/main/statistics_json.result | 48 ++++++++++++++++++++++++++++++++++ mysql-test/main/statistics_json.test | 23 ++++++++++++++++ sql/opt_histogram_json.cc | 5 +++- sql/opt_histogram_json.h | 6 ++--- 4 files changed, 78 insertions(+), 4 deletions(-) diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result index 05b9020d62f..067c2d47204 100644 --- a/mysql-test/main/statistics_json.result +++ b/mysql-test/main/statistics_json.result @@ -7397,3 +7397,51 @@ id select_type table type possible_keys key key_len ref rows r_rows filtered r_f set histogram_type=@save_histogram_type; set histogram_size=@save_histogram_size; DROP SCHEMA world; +use test; +create table t10 ( +a varchar(10) +); +# +# Histograms are not collected for empty tables: +# +analyze table t10 persistent for all; +Table Op Msg_type Msg_text +test.t10 analyze status Engine-independent statistics collected +test.t10 analyze status Table is already up to date +select histogram +from mysql.column_stats where table_name='t10' and db_name=database(); +histogram +NULL +# +# Try with n_buckets > n_rows +# +insert into t10 values ('Berlin'),('Paris'),('Rome'); +set histogram_size=10, histogram_type='json_hb'; +analyze table t10 persistent for all; +Table Op Msg_type Msg_text +test.t10 analyze status Engine-independent statistics collected +test.t10 analyze status OK +select histogram +from mysql.column_stats where table_name='t10' and db_name=database(); +histogram +{ + "histogram_hb_v2": [ + { + "start": "Berlin", + "size": 0.333333333, + "ndv": 1 + }, + { + "start": "Paris", + "size": 0.333333333, + "ndv": 1 + }, + { + "start": "Rome", + "end": "Rome", + "size": 0.333333333, + "ndv": 1 + } + ] +} +drop table t10; diff --git a/mysql-test/main/statistics_json.test b/mysql-test/main/statistics_json.test index edb26219bcd..f279296b7d5 100644 --- a/mysql-test/main/statistics_json.test +++ b/mysql-test/main/statistics_json.test @@ -149,3 +149,26 @@ set histogram_type=@save_histogram_type; set histogram_size=@save_histogram_size; DROP SCHEMA world; +use test; + +create table t10 ( + a varchar(10) +); + +--echo # +--echo # Histograms are not collected for empty tables: +--echo # +analyze table t10 persistent for all; +select histogram +from mysql.column_stats where table_name='t10' and db_name=database(); + +--echo # +--echo # Try with n_buckets > n_rows +--echo # +insert into t10 values ('Berlin'),('Paris'),('Rome'); +set histogram_size=10, histogram_type='json_hb'; +analyze table t10 persistent for all; +select histogram +from mysql.column_stats where table_name='t10' and db_name=database(); + +drop table t10; diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 3cfb8ae6b88..979fca22a40 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -59,6 +59,8 @@ class Histogram_json_builder : public Histogram_builder : Histogram_builder(col, col_len, rows), histogram(hist) { bucket_capacity= records / histogram->get_width(); + if (bucket_capacity == 0) + bucket_capacity= 1; hist_width= histogram->get_width(); n_buckets_collected= 0; bucket.ndv= 0; @@ -227,7 +229,8 @@ class Histogram_json_builder : public Histogram_builder writer.end_object(); Binary_string *json_string= (Binary_string *) writer.output.get_string(); histogram->set_json_text(n_buckets_collected, - (uchar *) json_string->c_ptr()); + json_string->c_ptr(), + (size_t)json_string->length()); } }; diff --git a/sql/opt_histogram_json.h b/sql/opt_histogram_json.h index 83f107c13ac..b673bcc6b95 100644 --- a/sql/opt_histogram_json.h +++ b/sql/opt_histogram_json.h @@ -113,11 +113,11 @@ class Histogram_json_hb : public Histogram_base double range_selectivity(Field *field, key_range *min_endp, key_range *max_endp) override; - void set_json_text(ulonglong sz, uchar *json_text_arg) + void set_json_text(ulonglong sz, const char *json_text_arg, + size_t json_text_len) { size= (size_t) sz; - json_text.assign((const char*)json_text_arg, - strlen((const char*)json_text_arg)); + json_text.assign(json_text_arg, json_text_len); } private:

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[Commits] 5cbab7b371b: Fix the previous cset: next() should have element_count as parameter
by psergey 10 Sep '21

10 Sep '21

revision-id: 5cbab7b371bd4a10eb6f8fd3e7d90339cc5653e3 (mariadb-10.6.1-128-g5cbab7b371b) parent(s): 9cd4d76577a917c06a797ba2b758520a097f3355 author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-10 20:02:46 +0300 message: Fix the previous cset: next() should have element_count as parameter --- sql/opt_histogram_json.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 2f4174ecf51..3cfb8ae6b88 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -141,7 +141,7 @@ class Histogram_json_builder : public Histogram_builder @return 0 - OK */ - int next(void *elem, longlong elem_cnt) override + int next(void *elem, element_count elem_cnt) override { counters.next(elem, elem_cnt); ulonglong count= counters.get_count();

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[Commits] 9cd4d76577a: Fix compile warnings/error on Windows
by psergey 10 Sep '21

10 Sep '21

revision-id: 9cd4d76577a917c06a797ba2b758520a097f3355 (mariadb-10.6.1-127-g9cd4d76577a) parent(s): f46830e5b8ebebd907df170e80481487b713bb61 author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-10 19:49:33 +0300 message: Fix compile warnings/error on Windows --- sql/opt_histogram_json.cc | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index db75c8e09bd..2f4174ecf51 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -104,7 +104,7 @@ class Histogram_json_builder : public Histogram_builder @param elem The value we are writing @param cnt The number of such values. */ - void start_bucket(void *elem, element_count cnt) + void start_bucket(void *elem, longlong cnt) { DBUG_ASSERT(bucket.size == 0); column->store_field_value((uchar*) elem, col_length); @@ -121,7 +121,7 @@ class Histogram_json_builder : public Histogram_builder /* Append a value group of cnt values. */ - void append_to_bucket(element_count cnt) + void append_to_bucket(longlong cnt) { bucket.ndv++; bucket.size += cnt; @@ -141,7 +141,7 @@ class Histogram_json_builder : public Histogram_builder @return 0 - OK */ - int next(void *elem, element_count elem_cnt) override + int next(void *elem, longlong elem_cnt) override { counters.next(elem, elem_cnt); ulonglong count= counters.get_count();

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[Commits] f46830e5b8e: Fixes in opt_histogram_json.cc in the last commits
by psergey 10 Sep '21

10 Sep '21

revision-id: f46830e5b8ebebd907df170e80481487b713bb61 (mariadb-10.6.1-126-gf46830e5b8e) parent(s): 0984224d3ac33836f126464a46ff744bba3c786a author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-10 17:49:32 +0300 message: Fixes in opt_histogram_json.cc in the last commits Aslo add more test coverage --- mysql-test/main/statistics_json.result | 54 ++++++++++++++++++++++-- mysql-test/main/statistics_json.test | 63 ++++++++++++++++++++++++++-- sql/opt_histogram_json.cc | 77 ++++++++++++++++++++++++---------- 3 files changed, 167 insertions(+), 27 deletions(-) diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result index 3b701b89a0c..05b9020d62f 100644 --- a/mysql-test/main/statistics_json.result +++ b/mysql-test/main/statistics_json.result @@ -4028,10 +4028,58 @@ analyze select * from t1_json where a > 'zzzzzzzzz'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra 1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 10.00 0.00 Using where drop table ten; -UPDATE mysql.column_stats SET histogram='["a-1", "a-2", {"a": "b"}, "a-3"]' WHERE table_name='t1_json'; +UPDATE mysql.column_stats +SET histogram='["not-what-you-expect"]' WHERE table_name='t1_json'; FLUSH TABLES; -explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; -ERROR HY000: Failed to parse histogram: Root JSON element must be a JSON object at offset 12345. +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: Root JSON element must be a JSON object at offset 0. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":"not-histogram"}' WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: A JSON array expected at offset 0. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":["not-a-bucket"]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: Object expected at offset 19. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"no-expected-members":1}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: .start member must be present and be a scalar at offset 20. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":{}}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: .start member must be present and be a scalar at offset 20. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":"not-an-integer"}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: .size member must be present and be a scalar at offset 20. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: .ndv member must be present and be a scalar at offset 20. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25, "ndv":1}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: .end must be present in the last bucket and only there at offset 0. +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +explain select * from t1_json limit 1; +ERROR HY000: Failed to parse histogram: .end must be present in the last bucket and only there at offset 0. create table t2 ( city varchar(100) ); diff --git a/mysql-test/main/statistics_json.test b/mysql-test/main/statistics_json.test index be223f5e4a4..edb26219bcd 100644 --- a/mysql-test/main/statistics_json.test +++ b/mysql-test/main/statistics_json.test @@ -39,12 +39,69 @@ analyze select * from t1_json where a > 'zzzzzzzzz'; drop table ten; -# test different valid JSON strings that are invalid histograms. -UPDATE mysql.column_stats SET histogram='["a-1", "a-2", {"a": "b"}, "a-3"]' WHERE table_name='t1_json'; +# +# Test different valid JSON strings that are invalid histograms. +# +UPDATE mysql.column_stats +SET histogram='["not-what-you-expect"]' WHERE table_name='t1_json'; FLUSH TABLES; --error ER_JSON_HISTOGRAM_PARSE_FAILED -explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; +explain select * from t1_json limit 1; + +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":"not-histogram"}' WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; + +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":["not-a-bucket"]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; + +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"no-expected-members":1}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; + +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":{}}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; + +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":"not-an-integer"}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; + +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; + +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25, "ndv":1}]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; +UPDATE mysql.column_stats +SET histogram='{"histogram_hb_v2":[]}' +WHERE table_name='t1_json'; +FLUSH TABLES; +--error ER_JSON_HISTOGRAM_PARSE_FAILED +explain select * from t1_json limit 1; --source include/have_sequence.inc create table t2 ( diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 51007044814..db75c8e09bd 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -94,8 +94,8 @@ class Histogram_json_builder : public Histogram_builder { column->store_field_value((uchar*) elem, col_length); StringBuffer<MAX_FIELD_WIDTH> val; - column->val_str(&val); - writer.add_member("end").add_str(val.c_ptr()); + String *str= column->val_str(&val); + writer.add_member("end").add_str(str->c_ptr_safe()); finalize_bucket(); } @@ -109,10 +109,10 @@ class Histogram_json_builder : public Histogram_builder DBUG_ASSERT(bucket.size == 0); column->store_field_value((uchar*) elem, col_length); StringBuffer<MAX_FIELD_WIDTH> val; - column->val_str(&val); + String *str= column->val_str(&val); writer.start_object(); - writer.add_member("start").add_str(val.c_ptr()); + writer.add_member("start").add_str(str->c_ptr_safe()); bucket.ndv= 1; bucket.size= cnt; @@ -264,14 +264,17 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, const char *err; DBUG_ENTER("Histogram_json_hb::parse"); DBUG_ASSERT(type_arg == JSON_HB); + const char *err_pos= hist_data; const char *obj1; int obj1_len; double cumulative_size= 0.0; + size_t end_member_index= (size_t)-1; if (JSV_OBJECT != json_type(hist_data, hist_data + hist_data_len, &obj1, &obj1_len)) { err= "Root JSON element must be a JSON object"; + err_pos= hist_data; goto error; } @@ -281,6 +284,7 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, "histogram_hb_v2", &hist_array, &hist_array_len)) { + err_pos= obj1; err= "A JSON array expected"; goto error; } @@ -296,11 +300,13 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, break; if (ret == JSV_BAD_JSON) { + err_pos= hist_array; err= "JSON parse error"; goto error; } if (ret != JSV_OBJECT) { + err_pos= hist_array; err= "Object expected"; goto error; } @@ -313,6 +319,7 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, "start", &val, &val_len); if (ret != JSV_STRING && ret != JSV_NUMBER) { + err_pos= bucket_info; err= ".start member must be present and be a scalar"; goto error; } @@ -324,6 +331,7 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, "size", &size, &size_len); if (ret != JSV_NUMBER) { + err_pos= bucket_info; err= ".size member must be present and be a scalar"; goto error; } @@ -333,6 +341,7 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, double size_d= my_strtod(size, &size_end, &conv_err); if (conv_err) { + err_pos= size; err= ".size member must be a floating-point value"; goto error; } @@ -345,6 +354,7 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, "ndv", &ndv, &ndv_len); if (ret != JSV_NUMBER) { + err_pos= bucket_info; err= ".ndv member must be present and be a scalar"; goto error; } @@ -352,41 +362,58 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, longlong ndv_ll= my_strtoll10(ndv, &ndv_end, &conv_err); if (conv_err) { + err_pos= ndv; err= ".ndv member must be an integer value"; goto error; } + + uchar buf[MAX_KEY_LENGTH]; + uint len_to_copy= field->key_length(); + field->store_text(val, val_len, &my_charset_bin); + uint bytes= field->get_key_image(buf, len_to_copy, Field::itRAW); + + buckets.push_back({std::string((char*)buf, bytes), cumulative_size, + ndv_ll}); + + // Read the "end" field const char *end_val; int end_val_len; ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len, "end", &end_val, &end_val_len); if (ret != JSV_NOTHING && ret != JSV_STRING && ret !=JSV_NUMBER) { + err_pos= bucket_info; err= ".end member must be a scalar"; goto error; } if (ret != JSV_NOTHING) - last_bucket_end_endp.assign(end_val, end_val_len); - - buckets.push_back({std::string(val, val_len), NULL, cumulative_size, - ndv_ll}); - - if (buckets.size()) { - auto& prev_bucket= buckets[buckets.size()-1]; - if (prev_bucket.ndv == 1) - prev_bucket.end_value= &prev_bucket.start_value; - else - prev_bucket.end_value= &buckets.back().start_value; + field->store_text(end_val, end_val_len, &my_charset_bin); + uint bytes= field->get_key_image(buf, len_to_copy, Field::itRAW); + last_bucket_end_endp.assign((char*)buf, bytes); + if (end_member_index == (size_t)-1) + end_member_index= buckets.size(); } } - buckets.back().end_value= &last_bucket_end_endp; size= buckets.size(); + if (end_member_index != buckets.size()) + { + err= ".end must be present in the last bucket and only there"; + err_pos= hist_data; + goto error; + } + if (!buckets.size()) + { + err= ".end member is allowed only in last bucket"; + err_pos= hist_data; + goto error; + } + DBUG_RETURN(false); error: - my_error(ER_JSON_HISTOGRAM_PARSE_FAILED, MYF(0), err, - 12345); + my_error(ER_JSON_HISTOGRAM_PARSE_FAILED, MYF(0), err, err_pos - hist_data); DBUG_RETURN(true); } @@ -469,7 +496,7 @@ double Histogram_json_hb::point_selectivity(Field *field, key_range *endpoint, * The bucket has one value and this is the value we are looking for. * The bucket has multiple values. Then, assume */ - sel= (get_left_fract(idx) - buckets[idx].cum_fract) / buckets[idx].ndv; + sel= (buckets[idx].cum_fract - get_left_fract(idx)) / buckets[idx].ndv; } return sel; } @@ -483,6 +510,14 @@ double Histogram_json_hb::get_left_fract(int idx) return buckets[idx-1].cum_fract; } +std::string& Histogram_json_hb::get_end_value(int idx) +{ + if (idx == (int)buckets.size()-1) + return last_bucket_end_endp; + else + return buckets[idx+1].start_value; +} + /* @param field The table field histogram is for. We don't care about the field's current value, we only need its virtual functions to @@ -514,7 +549,7 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, double left_fract= get_left_fract(idx); double sel= position_in_interval(field, min_key, min_key_len, buckets[idx].start_value, - *buckets[idx].end_value); + get_end_value(idx)); min= left_fract + sel * (buckets[idx].cum_fract - left_fract); } @@ -538,7 +573,7 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, double left_fract= get_left_fract(idx); double sel= position_in_interval(field, max_key, max_key_len, buckets[idx].start_value, - *buckets[idx].end_value); + get_end_value(idx)); max= left_fract + sel * (buckets[idx].cum_fract - left_fract); } else

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[Commits] 0984224d3ac: Valgrind fixes, poor .result fixes, code cleanups
by psergey 10 Sep '21

10 Sep '21

revision-id: 0984224d3ac33836f126464a46ff744bba3c786a (mariadb-10.6.1-125-g0984224d3ac) parent(s): 2dccb706369b4e523c8fb2dcef95ac83fbd71e0a author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-10 17:16:43 +0300 message: Valgrind fixes, poor .result fixes, code cleanups - Use String::c_ptr_safe() instead of String::c_ptr - Do proper datatype conversions in Histogram_json_hb::parse - Remove Histogram_json_hb::Bucket::end_value. Introduce get_end_value() instead. --- mysql-test/main/statistics_json.result | 8 ++++---- sql/opt_histogram_json.h | 4 +--- 2 files changed, 5 insertions(+), 7 deletions(-) diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result index 75ba065f89b..3b701b89a0c 100644 --- a/mysql-test/main/statistics_json.result +++ b/mysql-test/main/statistics_json.result @@ -4013,12 +4013,12 @@ test t1_json a a-0 a-9 0.0000 3.0000 1.0000 10 JSON_HB { } explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 Using where +1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 50.00 Using where Warnings: Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` between 'a-3a' and 'zzzzzzzzz' analyze select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 10.00 60.00 Using where +1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 50.00 60.00 Using where explain extended select * from t1_json where a < 'b-1a'; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 90.00 Using where @@ -4053,12 +4053,12 @@ id select_type table type possible_keys key key_len ref rows r_rows filtered r_f 1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 98.02 Using where explain extended select * from t2 where city = 'Helsinki'; id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 101 1.98 Using where Warnings: Note 1003 select `test`.`t2`.`city` AS `city` from `test`.`t2` where `test`.`t2`.`city` = 'Helsinki' analyze select * from t2 where city = 'helsinki'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 1.98 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 1.98 1.98 Using where explain extended select * from t2 where city < 'Lagos'; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where diff --git a/sql/opt_histogram_json.h b/sql/opt_histogram_json.h index ed48d951a7f..83f107c13ac 100644 --- a/sql/opt_histogram_json.h +++ b/sql/opt_histogram_json.h @@ -61,9 +61,6 @@ class Histogram_json_hb : public Histogram_base // value is in this bucket. std::string start_value; - // The right endpoint. It is non-inclusive, except for the last bucket. - std::string *end_value; - // Cumulative fraction: The fraction of table rows that fall into this // and preceding buckets. double cum_fract; @@ -125,6 +122,7 @@ class Histogram_json_hb : public Histogram_base private: double get_left_fract(int idx); + std::string& get_end_value(int idx); int find_bucket(Field *field, const uchar *lookup_val, bool equal_is_less); };

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[Commits] 2dccb706369: Fix compile error on windows
by psergey 10 Sep '21

10 Sep '21

revision-id: 2dccb706369b4e523c8fb2dcef95ac83fbd71e0a (mariadb-10.6.1-124-g2dccb706369) parent(s): e92d464e51f869144d683e19368762e74f5c7e98 author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-10 14:59:32 +0300 message: Fix compile error on windows --- sql/opt_histogram_json.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 9461bd03dbf..51007044814 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -58,7 +58,7 @@ class Histogram_json_builder : public Histogram_builder ha_rows rows) : Histogram_builder(col, col_len, rows), histogram(hist) { - bucket_capacity= (double)records / histogram->get_width(); + bucket_capacity= records / histogram->get_width(); hist_width= histogram->get_width(); n_buckets_collected= 0; bucket.ndv= 0;

1 0

[Commits] e92d464e51f: MDEV-26519: JSON Histograms: improve histogram collection
by psergey 10 Sep '21

10 Sep '21

revision-id: e92d464e51f869144d683e19368762e74f5c7e98 (mariadb-10.6.1-123-ge92d464e51f) parent(s): bfdc2ee636901e6f4c86a94e082092e5edc931a1 author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-10 10:45:04 +0300 message: MDEV-26519: JSON Histograms: improve histogram collection Basic ideas: 1. Store "popular" values in their own buckets. 2. Also store ndv (Number of Distinct Values) in each bucket. Because of #1, the buckets are now variable-size, so store the size in each bucket. Adjust selectivity estimation functions accordingly. --- mysql-test/main/statistics_json.result | 6538 ++++++++++++++++++++++++++------ sql/opt_histogram_json.cc | 453 ++- sql/opt_histogram_json.h | 51 +- 3 files changed, 5723 insertions(+), 1319 deletions(-) diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result index 102fcfff194..75ba065f89b 100644 --- a/mysql-test/main/statistics_json.result +++ b/mysql-test/main/statistics_json.result @@ -232,12 +232,12 @@ nulls_ratio, avg_frequency, hist_size, hist_type, HEX(histogram) FROM mysql.column_stats; db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size hist_type HEX(histogram) -test t1 a 0 49 0.0000 1.0000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2230222C20223131222C20223234222C20223338222C20223439225D0A7D -test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 6.4000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A202020202276767676767676767676767676222C0A202020202277777777777777777777777777777777777777777777777777777777222C0A20202020227878787878787878787878787878787878787878787878787878222C0A2020202022797979222C0A20202020227A7A7A7A7A7A7A7A7A7A7A7A7A7A7A7A7A7A220A20205D0A7D -test t1 c aaaa dddddddd 0.1250 7.0000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2261616161222C202261616161222C2022636363636363636363222C20226464646464646464222C20226464646464646464225D0A7D -test t1 d 1989-03-12 1999-07-23 0.1500 8.5000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A2020202022313938392D30332D3132222C0A2020202022313938392D30332D3132222C0A2020202022313939302D30352D3135222C0A2020202022313939382D30382D3238222C0A2020202022313939392D30372D3233220A20205D0A7D -test t1 e 0.01 0.112 0.2250 6.2000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B22302E3031222C2022302E3031222C2022302E3035222C2022302E31222C2022302E313132225D0A7D -test t1 f 1 5 0.2000 6.4000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2201222C202202222C202203222C202204222C202205225D0A7D +test t1 a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test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 6.4000 4 JSON_HB 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 +test t1 c aaaa dddddddd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test t1 d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test t1 e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test t1 f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mysql.column_stats; set histogram_size=8; set histogram_type=@DOUBLE_PREC_TYPE; @@ -251,12 +251,12 @@ nulls_ratio, avg_frequency, hist_size, hist_type, HEX(histogram) FROM mysql.column_stats; db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size hist_type HEX(histogram) -test t1 a 0 49 0.0000 1.0000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2230222C202235222C20223131222C20223138222C20223234222C20223332222C20223338222C20223433222C20223439225D0A7D -test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz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test t1 c aaaa dddddddd 0.1250 7.0000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A202020202261616161222C0A202020202261616161222C0A202020202261616161222C0A2020202022626262626262222C0A2020202022636363636363636363222C0A2020202022636363636363636363222C0A20202020226464646464646464222C0A20202020226464646464646464222C0A20202020226464646464646464220A20205D0A7D -test t1 d 1989-03-12 1999-07-23 0.1500 8.5000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A2020202022313938392D30332D3132222C0A2020202022313938392D30332D3132222C0A2020202022313938392D30332D3132222C0A2020202022313939302D30352D3135222C0A2020202022313939302D30352D3135222C0A2020202022313939302D30352D3135222C0A2020202022313939382D30382D3238222C0A2020202022313939392D30372D3233222C0A2020202022313939392D30372D3233220A20205D0A7D -test t1 e 0.01 0.112 0.2250 6.2000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A2020202022302E3031222C0A2020202022302E3031222C0A2020202022302E3031222C0A2020202022302E3031222C0A2020202022302E3035222C0A2020202022302E31222C0A2020202022302E31222C0A2020202022302E313132222C0A2020202022302E313132220A20205D0A7D -test t1 f 1 5 0.2000 6.4000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2201222C202202222C202202222C202203222C202203222C202204222C202204222C202205222C202205225D0A7D +test t1 a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test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz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test 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020202022656E64223A202231303234222C0A2020202020202273697A65223A20322E343431343036652D342C0A202020202020226E6476223A20310A202020207D0A20205D0A7D set histogram_size=0; drop table t1, t2; set use_stat_tables=@save_use_stat_tables; @@ -2176,18 +3562,63 @@ DECODE_HISTOGRAM(hist_type, histogram) from mysql.column_stats; table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram) t1 id 1 17384 0.0000 4.0000 14.0000 { - "histogram_hb_v1": [ - "1", - "1639", - "3277", - "4916", - "6554", - "9193", - "10831", - "12469", - "14108", - "15746", - "17384" + "histogram_hb_v2": [ + { + "start": "1", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "1639", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "3277", + "size": 0.099997384, + "ndv": 1640 + }, + { + "start": "4916", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "6554", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "8192", + "size": 0.099997384, + "ndv": 1640 + }, + { + "start": "10831", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "12469", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "14107", + "size": 0.099997384, + "ndv": 1640 + }, + { + "start": "15746", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "17384", + "end": "17384", + "size": 2.615792e-5, + "ndv": 1 + } ] } set analyze_sample_percentage=0.1; @@ -2203,18 +3634,63 @@ DECODE_HISTOGRAM(hist_type, histogram) from mysql.column_stats; table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram) t1 id 111 17026 0.0000 4.0000 10.4739 { - "histogram_hb_v1": [ - "111", - "988", - "2490", - "4088", - "5743", - "7806", - "10217", - "12072", - "14178", - "15144", - "17026" + "histogram_hb_v2": [ + { + "start": "111", + "size": 0.099056604, + "ndv": 20 + }, + { + "start": "988", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "2490", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "4088", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "5743", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "7772", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "10164", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "12022", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "14092", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "15122", + "size": 0.099056604, + "ndv": 21 + }, + { + "start": "16975", + "end": "17026", + "size": 0.009433962, + "ndv": 2 + } ] } # @@ -2230,18 +3706,63 @@ DECODE_HISTOGRAM(hist_type, histogram) from mysql.column_stats; table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram) t1 id 1 17384 0.0000 4.0000 14.0401 { - "histogram_hb_v1": [ - "1", - "1623", - "3252", - "4868", - "6483", - "8151", - "10789", - "12433", - "14077", - "15724", - "17384" + "histogram_hb_v2": [ + { + "start": "1", + "size": 0.09999826, + "ndv": 1591 + }, + { + "start": "1623", + "size": 0.09999826, + "ndv": 1600 + }, + { + "start": "3252", + "size": 0.09999826, + "ndv": 1587 + }, + { + "start": "4868", + "size": 0.09999826, + "ndv": 1593 + }, + { + "start": "6483", + "size": 0.09999826, + "ndv": 1630 + }, + { + "start": "8151", + "size": 0.09999826, + "ndv": 1608 + }, + { + "start": "10789", + "size": 0.09999826, + "ndv": 1619 + }, + { + "start": "12433", + "size": 0.09999826, + "ndv": 1627 + }, + { + "start": "14077", + "size": 0.09999826, + "ndv": 1614 + }, + { + "start": "15724", + "size": 0.09999826, + "ndv": 1624 + }, + { + "start": "17384", + "end": "17384", + "size": 1.739705e-5, + "ndv": 1 + } ] } set analyze_sample_percentage=0; @@ -2257,18 +3778,63 @@ DECODE_HISTOGRAM(hist_type, histogram) from mysql.column_stats; table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram) t1 id 1 17384 0.0000 4.0000 13.9812 { - "histogram_hb_v1": [ - "1", - "1651", - "3306", - "4948", - "6596", - "9239", - "10863", - "12495", - "14113", - "15757", - "17384" + "histogram_hb_v2": [ + { + "start": "1", + "size": 0.099999181, + "ndv": 1651 + }, + { + "start": "1651", + "size": 0.099999181, + "ndv": 1656 + }, + { + "start": "3306", + "size": 0.099999181, + "ndv": 1642 + }, + { + "start": "4948", + "size": 0.099999181, + "ndv": 1649 + }, + { + "start": "6596", + "size": 0.099999181, + "ndv": 1644 + }, + { + "start": "9239", + "size": 0.099999181, + "ndv": 1625 + }, + { + "start": "10863", + "size": 0.099999181, + "ndv": 1633 + }, + { + "start": "12495", + "size": 0.099999181, + "ndv": 1619 + }, + { + "start": "14113", + "size": 0.099999181, + "ndv": 1645 + }, + { + "start": "15757", + "size": 0.099999181, + "ndv": 1628 + }, + { + "start": "17384", + "end": "17384", + "size": 8.190612e-6, + "ndv": 1 + } ] } # @@ -2290,18 +3856,63 @@ DECODE_HISTOGRAM(hist_type, histogram) from mysql.column_stats; table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram) t1 id 1 17384 0.0000 4.0000 14.0000 { - "histogram_hb_v1": [ - "1", - "1639", - "3277", - "4916", - "6554", - "9193", - "10831", - "12469", - "14108", - "15746", - "17384" + "histogram_hb_v2": [ + { + "start": "1", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "1639", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "3277", + "size": 0.099997384, + "ndv": 1640 + }, + { + "start": "4916", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "6554", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "8192", + "size": 0.099997384, + "ndv": 1640 + }, + { + "start": "10831", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "12469", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "14107", + "size": 0.099997384, + "ndv": 1640 + }, + { + "start": "15746", + "size": 0.099997384, + "ndv": 1639 + }, + { + "start": "17384", + "end": "17384", + "size": 2.615792e-5, + "ndv": 1 + } ] } explain select * from t1; @@ -2345,122 +3956,72 @@ test.t1_json analyze status Engine-independent statistics collected test.t1_json analyze status OK select * from mysql.column_stats where table_name='t1_json'; db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size hist_type histogram -test t1_json a a-0 a-9 0.0000 3.0000 1.0000 100 JSON_HB { - "histogram_hb_v1": [ - "a-0", - "a-0", - "a-0", - "a-0", - "a-0", - "a-0", - "a-0", - "a-0", - "a-0", - "a-0", - "a-1", - "a-1", - "a-1", - "a-1", - "a-1", - "a-1", - "a-1", - "a-1", - "a-1", - "a-1", - "a-2", - "a-2", - "a-2", - "a-2", - "a-2", - "a-2", - "a-2", - "a-2", - "a-2", - "a-2", - "a-3", - "a-3", - "a-3", - "a-3", - "a-3", - "a-3", - "a-3", - "a-3", - "a-3", - "a-3", - "a-4", - "a-4", - "a-4", - "a-4", - "a-4", - "a-4", - "a-4", - "a-4", - "a-4", - "a-4", - "a-5", - "a-5", - "a-5", - "a-5", - "a-5", - "a-5", - "a-5", - "a-5", - "a-5", - "a-5", - "a-6", - "a-6", - "a-6", - "a-6", - "a-6", - "a-6", - "a-6", - "a-6", - "a-6", - "a-6", - "a-7", - "a-7", - "a-7", - "a-7", - "a-7", - "a-7", - "a-7", - "a-7", - "a-7", - "a-7", - "a-8", - "a-8", - "a-8", - "a-8", - "a-8", - "a-8", - "a-8", - "a-8", - "a-8", - "a-8", - "a-9", - "a-9", - "a-9", - "a-9", - "a-9", - "a-9", - "a-9", - "a-9", - "a-9", - "a-9", - "a-9" +test t1_json a a-0 a-9 0.0000 3.0000 1.0000 10 JSON_HB { + "histogram_hb_v2": [ + { + "start": "a-0", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-1", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-2", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-3", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-4", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-5", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-6", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-7", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-8", + "size": 0.1, + "ndv": 1 + }, + { + "start": "a-9", + "end": "a-9", + "size": 0.1, + "ndv": 1 + } ] } explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 59.41 Using where +1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 Using where Warnings: Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` between 'a-3a' and 'zzzzzzzzz' analyze select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 59.41 60.00 Using where +1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 10.00 60.00 Using where explain extended select * from t1_json where a < 'b-1a'; id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 99.01 Using where +1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 90.00 Using where Warnings: Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` < 'b-1a' analyze select * from t1_json where a > 'zzzzzzzzz'; @@ -2470,7 +4031,7 @@ drop table ten; UPDATE mysql.column_stats SET histogram='["a-1", "a-2", {"a": "b"}, "a-3"]' WHERE table_name='t1_json'; FLUSH TABLES; explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; -ERROR HY000: Failed to parse histogram: Root JSON element must be a JSON object at offset 1. +ERROR HY000: Failed to parse histogram: Root JSON element must be a JSON object at offset 12345. create table t2 ( city varchar(100) ); @@ -2484,20 +4045,20 @@ test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK explain extended select * from t2 where city = 'Moscow'; id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 101 98.04 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where Warnings: Note 1003 select `test`.`t2`.`city` AS `city` from `test`.`t2` where `test`.`t2`.`city` = 'Moscow' analyze select * from t2 where city = 'Moscow'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 98.04 98.02 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 98.02 Using where explain extended select * from t2 where city = 'Helsinki'; id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 101 2.00 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where Warnings: Note 1003 select `test`.`t2`.`city` AS `city` from `test`.`t2` where `test`.`t2`.`city` = 'Helsinki' analyze select * from t2 where city = 'helsinki'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 2.00 1.98 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 1.98 Using where explain extended select * from t2 where city < 'Lagos'; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where @@ -2514,672 +4075,3277 @@ set histogram_size=50; ANALYZE TABLE Country, City, CountryLanguage persistent for all; SELECT column_name, min_value, max_value, hist_size, hist_type, histogram FROM mysql.column_stats; column_name min_value max_value hist_size hist_type histogram -Code ABW ZWE 50 JSON_HB { - "histogram_hb_v1": [ - "ABW", - "ALB", - "ARM", - "AUS", - "BEN", - "BHR", - "BMU", - "BTN", - "CCK", - "CMR", - "COL", - "CXR", - "DJI", - "ECU", - "ESP", - "FLK", - "GBR", - "GLP", - "GRD", - "GUM", - "HRV", - "IOT", - "ISR", - "JPN", - "KIR", - "LBN", - "LKA", - "MAC", - "MDG", - "MLI", - "MOZ", - "MWI", - "NCL", - "NIU", - "NZL", - "PER", - "PRI", - "PSE", - "RUS", - "SGP", - "SLE", - "SPM", - "SWE", - "TCD", - "TKM", - "TUR", - "UGA", - "UZB", - "VIR", - "YEM", - "ZWE" +Code ABW ZWE 60 JSON_HB { + "histogram_hb_v2": [ + { + "start": "ABW", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ALB", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ARG", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ATF", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "AZE", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "BFA", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "BHS", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "BMU", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "BRN", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "CAF", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "CHL", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "COD", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "COM", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "CXR", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "DEU", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "DOM", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ERI", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ETH", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "FRA", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "GBR", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "GIN", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "GNQ", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "GTM", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "HKG", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "HTI", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "IOT", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ISL", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "JOR", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "KGZ", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "KOR", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "LBR", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "LKA", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "LVA", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "MDA", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "MHL", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "MMR", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "MRT", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "MWI", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "NCL", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "NIC", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "NPL", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "PAK", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "PHL", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "PRI", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "PSE", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ROM", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "SDN", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "SHN", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "SLV", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "STP", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "SWE", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "TCA", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "TJK", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "TON", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "TUV", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "UKR", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "UZB", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "VGB", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "WLF", + "size": 0.016736402, + "ndv": 4 + }, + { + "start": "ZAF", + "end": "ZWE", + "size": 0.012552301, + "ndv": 3 + } ] } -Name Afghanistan Zimbabwe 50 JSON_HB { - "histogram_hb_v1": [ - "Afghanistan", - "Andorra", - "Argentina", - "Azerbaijan", - "Belarus", - "Bermuda", - "Bouvet Island", - "Burkina Faso", - "Cape Verde", - "China", - "Comoros", - "Croatia", - "Denmark", - "Ecuador", - "Eritrea", - "Fiji Islands", - "French Southern territories", - "Ghana", - "Guadeloupe", - "Guinea-Bissau", - "Honduras", - "Indonesia", - "Italy", - "Kazakstan", - "Laos", - "Libyan Arab Jamahiriya", - "Macedonia", - "Mali", - "Mauritania", - "Moldova", - "Mozambique", - "Netherlands", - "Nicaragua", - "North Korea", - "Palau", - "Peru", - "Puerto Rico", - "Rwanda", - "Saint Pierre and Miquelon", - "Saudi Arabia", - "Slovakia", - "South Africa", - "Sudan", - "Switzerland", - "Thailand", - "Tunisia", - "Tuvalu", - "United States", - "Venezuela", - "Western Sahara", - "Zimbabwe" +Country ABW ZWE 39 JSON_HB { + "histogram_hb_v2": [ + { + "start": "ABW", + "size": 0.019857808, + "ndv": 11 + }, + { + "start": "ASM", + "size": 0.019857808, + "ndv": 14 + }, + { + "start": "BIH", + "size": 0.007109586, + "ndv": 5 + }, + { + "start": "BRA", + "size": 0.061289532, + "ndv": 1 + }, + { + "start": "BRB", + "size": 0.019857808, + "ndv": 9 + }, + { + "start": "CHL", + "size": 0.002451581, + "ndv": 1 + }, + { + "start": "CHN", + "size": 0.0889924, 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0.019857808, + "ndv": 79 + }, + { + "start": "179000", + "size": 0.019857808, + "ndv": 79 + }, + { + "start": "185154", + "size": 0.019857808, + "ndv": 77 + }, + { + "start": "192733", + "size": 0.019857808, + "ndv": 77 + }, + { + "start": "200827", + "size": 0.019857808, + "ndv": 80 + }, + { + "start": "210068", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "221047", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "233400", + "size": 0.019857808, + "ndv": 80 + }, + { + "start": "246535", + "size": 0.019857808, + "ndv": 80 + }, + { + "start": "262481", + "size": 0.019857808, + "ndv": 80 + }, + { + "start": "277305", + "size": 0.019857808, + "ndv": 78 + }, + { + "start": "296127", + "size": 0.019857808, + "ndv": 78 + }, + { + "start": "315382", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "337580", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "361747", + "size": 0.019857808, + "ndv": 79 + }, + { + "start": "390350", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "425836", + "size": 0.019857808, + "ndv": 80 + }, + { + "start": "468931", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "517785", + "size": 0.019857808, + "ndv": 77 + }, + { + "start": "593321", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "703324", + "size": 0.019857808, + "ndv": 79 + }, + { + "start": "877239", + "size": 0.019857808, + "ndv": 79 + }, + { + "start": "1157507", + "size": 0.019857808, + "ndv": 79 + }, + { + "start": "1704735", + "size": 0.019857808, + "ndv": 81 + }, + { + "start": "4336000", + "end": "10500000", + "size": 0.007109586, + "ndv": 29 + } ] } -Country ABW ZWE 50 JSON_HB { - "histogram_hb_v1": [ - "ABW", - "ALB", - "ATG", - "AZE", - "BFA", - "BIH", - "BRB", - "CAN", - "CHL", - "CMR", - "COG", - "CRI", - "DEU", - "ECU", - "ETH", - "FRO", - "GEO", - "GMB", - "GTM", - "HND", - "IDN", - "IRN", - "ITA", - "KAZ", - "KHM", - "LBR", - "LTU", - "MAR", - "MHL", - "MMR", - "MOZ", - "MUS", - "NAM", - "NGA", - "NPL", - "PAK", - "PHL", - "PRY", - "RUS", - "SDN", - "SLE", - "SVK", - "TCA", - "THA", - "TUN", - "TZA", - "UKR", - "UZB", - "VNM", - "ZAF", - "ZWE" +Country ABW ZWE 52 JSON_HB { + "histogram_hb_v2": [ + { + "start": "ABW", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "ALB", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "ASM", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "AZE", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "BEN", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "BHR", + "size": 0.019308943, + "ndv": 8 + }, + { + "start": "BRA", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "CAF", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "CHE", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "CIV", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "COD", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "COM", + "size": 0.019308943, + "ndv": 8 + }, + { + "start": "CZE", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "DNK", + "size": 0.019308943, + "ndv": 8 + }, + { + "start": "ESP", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "FIN", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "GAB", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "GIB", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "GNB", + "size": 0.019308943, + "ndv": 8 + }, + { + "start": "GUM", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "HUN", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "IND", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "IRQ", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "JAM", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "KEN", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "KIR", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "LBR", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "LTU", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "MCO", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "MHL", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "MMR", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "MOZ", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "MUS", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "NAM", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "NGA", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "NOR", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "PAK", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "PHL", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "PRK", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "ROM", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "RWA", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "SGP", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "SOM", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "SWE", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "TGO", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "TKM", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "TWN", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "UGA", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "USA", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "VEN", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "WLF", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "ZAF", + "end": "ZWE", + "size": 0.015243902, + "ndv": 3 + } ] } -Language Abhyasi [South]Mande 50 JSON_HB { - "histogram_hb_v1": [ - "Abhyasi", - "Amhara", - "Arabic", - "Arawakan", - "Balante", - "Belorussian", - "Bulgariana", - "Chakma", - "Chinese", - "Comorian-madagassi", - "Creole French", - "Dinka", - "English", - "English", - "English", - "Ewe", - "French", - "Ful", - "Garifuna", - "German", - "Gujarati", - "Herero", - "Hungarian", - "Italian", - "Kanuri", - "Khoekhoe", - "Kosrean", - "Lithuanian", - "Macedonian", - "Malay-English", - "Maori", - "Meru", - "Mossi", - "Norwegian", - "Ouaddai", - "Pilipino", - "Portuguese", - "Romani", - "Russian", - "San", - "Shambala", - "Somali", - "Spanish", - "Spanish", - "Tagalog", - "Teso", - "Tswa", - "Turkmenian", - "Ukrainian and Russian", - "Wolea", - "[South]Mande" +Language Abhyasi [South]Mande 51 JSON_HB { + "histogram_hb_v2": [ + { + "start": "Abhyasi", + "size": 0.019308943, + "ndv": 11 + }, + { + "start": "Amhara", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "Arabic", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "Araucan", + "size": 0.019308943, + "ndv": 9 + }, + { + "start": "Bajan", + "size": 0.019308943, + "ndv": 16 + }, + { + "start": "Belorussian", + "size": 0.019308943, + "ndv": 9 + }, + { + "start": "Brahui", + "size": 0.019308943, + "ndv": 14 + }, + { + "start": "Catalan", + "size": 0.019308943, + "ndv": 12 + }, + { + "start": "Chinese", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "Circassian", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "Creole English", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "Danish", + "size": 0.019308943, + "ndv": 11 + }, + { + "start": "Dyula", + "size": 0.004065041, + "ndv": 4 + }, + { + "start": "English", + "size": 0.06097561, + "ndv": 1 + }, + { + "start": "Eskimo Languages", + "size": 0.014227642, + "ndv": 8 + }, + { + "start": "French", + "size": 0.025406504, + "ndv": 1 + }, + { + "start": "Fries", + "size": 0.019308943, + "ndv": 8 + }, + { + "start": "Gagauzi", + "size": 0.019308943, + "ndv": 8 + }, + { + "start": "German", + "size": 0.019308943, + "ndv": 9 + }, + { + "start": "Greek", + "size": 0.019308943, + "ndv": 15 + }, + { + "start": "Hausa", + "size": 0.019308943, + "ndv": 10 + }, + { + "start": "Hungarian", + "size": 0.019308943, + "ndv": 10 + }, + { + "start": "Italian", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "Joruba", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "Kazakh", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "Kongo", + "size": 0.019308943, + "ndv": 9 + }, + { + "start": "Kurdish", + "size": 0.019308943, + "ndv": 15 + }, + { + "start": "Luchazi", + "size": 0.019308943, + "ndv": 16 + }, + { + "start": "Makua", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "Malinke", + "size": 0.019308943, + "ndv": 15 + }, + { + "start": "Marma", + "size": 0.019308943, + "ndv": 17 + }, + { + "start": "Miskito", + "size": 0.019308943, + "ndv": 17 + }, + { + "start": "Naudemba", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "Nubian Languages", + "size": 0.019308943, + "ndv": 17 + }, + { + "start": "Palau", + "size": 0.019308943, + "ndv": 12 + }, + { + "start": "Polish", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "Portuguese", + "size": 0.019308943, + "ndv": 9 + }, + { + "start": "Romani", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "Russian", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "Sango", + "size": 0.019308943, + "ndv": 10 + }, + { + "start": "Shambala", + "size": 0.019308943, + "ndv": 11 + }, + { + "start": "Somali", + "size": 0.015243902, + "ndv": 9 + }, + { + "start": "Spanish", + "size": 0.028455285, + "ndv": 1 + }, + { + "start": "Sranantonga", + "size": 0.019308943, + "ndv": 11 + }, + { + "start": "Tamashek", + "size": 0.019308943, + "ndv": 9 + }, + { + "start": "Thai", + "size": 0.019308943, + "ndv": 14 + }, + { + "start": "Tswana", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "Turkmenian", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "Ukrainian and Russian", + "size": 0.019308943, + "ndv": 9 + }, + { + "start": "Watyi", + "size": 0.019308943, + "ndv": 14 + }, + { + "start": "Zulu", + "end": "[South]Mande", + "size": 0.00203252, + "ndv": 2 + } ] } -Percentage 0.0 99.9 50 JSON_HB { - "histogram_hb_v1": [ - "0.0", - "0.0", - "0.0", - "0.0", - "0.1", - "0.2", - "0.3", - "0.4", - "0.5", - "0.6", - "0.7", - "0.9", - "1.1", - "1.3", - "1.5", - "1.7", - "1.9", - "2.2", - "2.4", - "2.7", - "3.0", - "3.3", - "3.7", - "4.1", - "4.7", - "5.3", - "5.7", - "6.4", - "7.0", - "7.6", - "8.2", - "9.0", - "9.7", - "11.0", - "12.4", - "14.0", - "16.5", - "19.7", - "23.2", - "31.0", - "36.4", - "45.7", - "52.6", - "65.3", - "76.7", - "85.6", - "89.7", - "94.1", - "97.2", - "99.0", - "99.9" +Percentage 0.0 99.9 49 JSON_HB { + "histogram_hb_v2": [ + { + "start": "0.0", + "size": 0.066056911, + "ndv": 1 + }, + { + "start": "0.1", + "size": 0.020325203, + "ndv": 1 + }, + { + "start": "0.2", + "size": 0.022357724, + "ndv": 1 + }, + { + "start": "0.3", + "size": 0.017276423, + "ndv": 1 + }, + { + "start": "0.4", + "size": 0.025406504, + "ndv": 1 + }, + { + "start": "0.5", + "size": 0.020325203, + "ndv": 1 + }, + { + "start": "0.6", + "size": 0.020325203, + "ndv": 1 + }, + { + "start": "0.7", + "size": 0.019308943, + "ndv": 2 + }, + { + "start": "0.8", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "1.0", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "1.3", + "size": 0.019308943, + "ndv": 2 + }, + { + "start": "1.4", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "1.6", + "size": 0.019308943, + "ndv": 2 + }, + { + "start": "1.8", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "2.0", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "2.3", + "size": 0.019308943, + "ndv": 2 + }, + { + "start": "2.5", + "size": 0.019308943, + "ndv": 3 + }, + { + "start": "2.8", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "3.1", + "size": 0.019308943, + "ndv": 4 + }, + { + "start": "3.4", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "3.8", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "4.2", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "4.8", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "5.3", + "size": 0.019308943, + "ndv": 5 + }, + { + "start": "5.7", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "6.4", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "7.0", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "7.6", + "size": 0.019308943, + "ndv": 6 + }, + { + "start": "8.1", + "size": 0.019308943, + "ndv": 7 + }, + { + "start": "8.9", + "size": 0.019308943, + "ndv": 8 + }, + { + "start": "9.6", + "size": 0.019308943, + "ndv": 10 + }, + { + "start": "10.9", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "12.1", + "size": 0.019308943, + "ndv": 14 + }, + { + "start": "13.8", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "16.1", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "18.4", + "size": 0.019308943, + "ndv": 14 + }, + { + "start": "21.6", + "size": 0.019308943, + "ndv": 14 + }, + { + "start": "28.3", + "size": 0.019308943, + "ndv": 16 + }, + { + "start": "33.0", + "size": 0.019308943, + "ndv": 16 + }, + { + "start": "41.6", + "size": 0.019308943, + "ndv": 18 + }, + { + "start": "50.2", + "size": 0.019308943, + "ndv": 16 + }, + { + "start": "59.7", + "size": 0.019308943, + "ndv": 18 + }, + { + "start": "70.6", + "size": 0.019308943, + "ndv": 16 + }, + { + "start": "80.0", + "size": 0.019308943, + "ndv": 14 + }, + { + "start": "86.8", + "size": 0.019308943, + "ndv": 17 + }, + { + "start": "91.3", + "size": 0.019308943, + "ndv": 15 + }, + { + "start": "95.6", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "97.6", + "size": 0.019308943, + "ndv": 13 + }, + { + "start": "99.6", + "end": "99.9", + "size": 0.016260163, + "ndv": 2 + } ] } analyze select * from Country use index () where Code between 'BBC' and 'GGG'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 25.49 25.52 Using where +1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 25.10 25.52 Using where analyze select * from Country use index () where Code < 'BBC'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 7.84 7.11 Using where +1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 8.37 7.11 Using where set histogram_type=@save_histogram_type; set histogram_size=@save_histogram_size; DROP SCHEMA world; diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index f1030662572..9461bd03dbf 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -23,12 +23,35 @@ class Histogram_json_builder : public Histogram_builder { Histogram_json_hb *histogram; - uint hist_width; /* the number of points in the histogram */ - double bucket_capacity; /* number of rows in a bucket of the histogram */ - uint curr_bucket; /* number of the current bucket to be built */ + /* Number of buckets in the histogram */ + uint hist_width; - std::vector<std::string> bucket_bounds; - bool first_value= true; + /* + Number of rows that we intend to have in the bucket. That is, this is + + n_rows_in_table / histo_width + + Actual number of rows in the buckets we produce may vary because of + "popular values" and rounding. + */ + longlong bucket_capacity; + + /* Number of the buckets already collected */ + uint n_buckets_collected; + + /* Data about the bucket we are filling now */ + struct CurBucket + { + /* Number of values in the bucket so far. */ + longlong size; + + /* Number of distinct values in the bucket */ + int ndv; + }; + CurBucket bucket; + + /* Used to create the JSON representation of the histogram. */ + Json_writer writer; public: Histogram_json_builder(Histogram_json_hb *hist, Field *col, uint col_len, @@ -37,57 +60,159 @@ class Histogram_json_builder : public Histogram_builder { bucket_capacity= (double)records / histogram->get_width(); hist_width= histogram->get_width(); - curr_bucket= 0; + n_buckets_collected= 0; + bucket.ndv= 0; + bucket.size= 0; + + writer.start_object(); + writer.add_member(Histogram_json_hb::JSON_NAME).start_array(); } ~Histogram_json_builder() override = default; + bool bucket_is_empty() { return bucket.ndv == 0; } + + /* + Flush the current bucket out (to JSON output), and set it to be empty. + */ + void finalize_bucket() + { + double fract= (double) bucket.size / records; + writer.add_member("size").add_double(fract); + writer.add_member("ndv").add_ll(bucket.ndv); + writer.end_object(); + n_buckets_collected++; + + bucket.ndv= 0; + bucket.size= 0; + } + + /* + Same as finalize_bucket() but also provide the bucket's end value. + */ + void finalize_bucket_with_end_value(void *elem) + { + column->store_field_value((uchar*) elem, col_length); + StringBuffer<MAX_FIELD_WIDTH> val; + column->val_str(&val); + writer.add_member("end").add_str(val.c_ptr()); + finalize_bucket(); + } + + /* + Write the first value group to the bucket. + @param elem The value we are writing + @param cnt The number of such values. + */ + void start_bucket(void *elem, element_count cnt) + { + DBUG_ASSERT(bucket.size == 0); + column->store_field_value((uchar*) elem, col_length); + StringBuffer<MAX_FIELD_WIDTH> val; + column->val_str(&val); + + writer.start_object(); + writer.add_member("start").add_str(val.c_ptr()); + + bucket.ndv= 1; + bucket.size= cnt; + } + + /* + Append a value group of cnt values. + */ + void append_to_bucket(element_count cnt) + { + bucket.ndv++; + bucket.size += cnt; + } + /* @brief - Add data to the histogram. This call adds elem_cnt rows, each - of which has value of *elem. + Add data to the histogram. @detail - Subsequent next() calls will add values that are greater than *elem. + The call signals to add a "value group" of elem_cnt rows, each of which + has the same value that is provided in *elem. + + Subsequent next() calls will add values that are greater than the + current one. + + @return + 0 - OK */ int next(void *elem, element_count elem_cnt) override { counters.next(elem, elem_cnt); ulonglong count= counters.get_count(); - if (curr_bucket == hist_width) - return 0; - if (first_value) + /* + Ok, we've got a "value group" of elem_cnt identical values. + + If we take the values from the value group and put them into + the current bucket, how many values will be left after we've + filled the bucket? + */ + longlong overflow= bucket.size + elem_cnt - bucket_capacity; + + /* + Case #1: This value group should be put into a separate bucket, if + A. It fills the current bucket and also fills the next bucket, OR + B. It fills the current bucket, which was empty. + */ + if (overflow >= bucket_capacity || (bucket_is_empty() && overflow >= 0)) { - first_value= false; - column->store_field_value((uchar*) elem, col_length); - StringBuffer<MAX_FIELD_WIDTH> val; - column->val_str(&val); - bucket_bounds.push_back(std::string(val.ptr(), val.length())); + // Finalize the current bucket + if (!bucket_is_empty()) + finalize_bucket(); + + // Start/end the separate bucket for this value group. + start_bucket(elem, elem_cnt); + if (records == count) + finalize_bucket_with_end_value(elem); + else + finalize_bucket(); } - - if (count > bucket_capacity * (curr_bucket + 1)) + else if (overflow >= 0) { - column->store_field_value((uchar*) elem, col_length); - StringBuffer<MAX_FIELD_WIDTH> val; - column->val_str(&val); - bucket_bounds.emplace_back(val.ptr(), val.length()); - - curr_bucket++; - while (curr_bucket != hist_width && - count > bucket_capacity * (curr_bucket + 1)) + /* + Case #2: is when Case#1 doesn't hold, but we can still fill the + current bucket. + */ + + // If the bucket was empty, it would have been case #1. + DBUG_ASSERT(!bucket_is_empty()); + + /* + Finalize the current bucket. Put there enough values to make it hold + bucket_capacity values. + */ + append_to_bucket(bucket_capacity - bucket.size); + if (records == count && !overflow) + finalize_bucket_with_end_value(elem); + else + finalize_bucket(); + + if (overflow > 0) { - bucket_bounds.push_back(std::string(val.ptr(), val.length())); - curr_bucket++; + // Then, start the new bucket with the remaining values. + start_bucket(elem, overflow); } } + else + { + // Case #3: there's not enough values to fill the current bucket. + if (bucket_is_empty()) + start_bucket(elem, elem_cnt); + else + append_to_bucket(elem_cnt); + } - if (records == count && bucket_bounds.size() == hist_width) + if (records == count) { - column->store_field_value((uchar*) elem, col_length); - StringBuffer<MAX_FIELD_WIDTH> val; - column->val_str(&val); - bucket_bounds.push_back(std::string(val.ptr(), val.length())); + // This is the final value group. + if (!bucket_is_empty()) + finalize_bucket_with_end_value(elem); } return 0; } @@ -98,17 +223,10 @@ class Histogram_json_builder : public Histogram_builder */ void finalize() override { - Json_writer writer; - writer.start_object(); - writer.add_member(Histogram_json_hb::JSON_NAME).start_array(); - - for(auto& value: bucket_bounds) { - writer.add_str(value.c_str()); - } writer.end_array(); writer.end_object(); Binary_string *json_string= (Binary_string *) writer.output.get_string(); - histogram->set_json_text(bucket_bounds.size()-1, + histogram->set_json_text(n_buckets_collected, (uchar *) json_string->c_ptr()); } }; @@ -143,78 +261,132 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, Histogram_type type_arg, const char *hist_data, size_t hist_data_len) { + const char *err; DBUG_ENTER("Histogram_json_hb::parse"); DBUG_ASSERT(type_arg == JSON_HB); - const char *err; - json_engine_t je; - json_string_t key_name; + const char *obj1; + int obj1_len; + double cumulative_size= 0.0; - json_scan_start(&je, &my_charset_utf8mb4_bin, - (const uchar*)hist_data, - (const uchar*)hist_data+hist_data_len); - - if (json_read_value(&je) || je.value_type != JSON_VALUE_OBJECT) + if (JSV_OBJECT != json_type(hist_data, hist_data + hist_data_len, + &obj1, &obj1_len)) { err= "Root JSON element must be a JSON object"; goto error; } - json_string_set_str(&key_name, (const uchar*)JSON_NAME, - (const uchar*)JSON_NAME + strlen(JSON_NAME)); - json_string_set_cs(&key_name, system_charset_info); - - if (json_scan_next(&je) || je.state != JST_KEY || - !json_key_matches(&je, &key_name)) - { - err= "The first key in the object must be histogram_hb_v1"; - goto error; - } - - // The value must be a JSON array - if (json_read_value(&je) || (je.value_type != JSON_VALUE_ARRAY)) + const char *hist_array; + int hist_array_len; + if (JSV_ARRAY != json_get_object_key(obj1, obj1 + obj1_len, + "histogram_hb_v2", &hist_array, + &hist_array_len)) { err= "A JSON array expected"; goto error; } - // Read the array - while (!json_scan_next(&je)) + for (int i= 0;; i++) { - switch(je.state) + const char *bucket_info; + int bucket_info_len; + enum json_types ret= json_get_array_item(hist_array, hist_array+hist_array_len, + i, &bucket_info, + &bucket_info_len); + if (ret == JSV_NOTHING) + break; + if (ret == JSV_BAD_JSON) { - case JST_VALUE: - { - const char *val; - int val_len; - json_smart_read_value(&je, &val, &val_len); - if (je.value_type != JSON_VALUE_STRING && - je.value_type != JSON_VALUE_NUMBER && - je.value_type != JSON_VALUE_TRUE && - je.value_type != JSON_VALUE_FALSE) - { - err= "Scalar value expected"; - goto error; - } - uchar buf[MAX_KEY_LENGTH]; - uint len_to_copy= field->key_length(); - field->store_text(val, val_len, &my_charset_bin); - uint bytes= field->get_key_image(buf, len_to_copy, Field::itRAW); - histogram_bounds.push_back(std::string((char*)buf, bytes)); - // TODO: Should we also compare this endpoint with the previous - // to verify that the ordering is right? - break; - } - case JST_ARRAY_END: - break; + err= "JSON parse error"; + goto error; + } + if (ret != JSV_OBJECT) + { + err= "Object expected"; + goto error; + } + + // Ok, now we are parsing the JSON object describing the bucket + // Read the "start" field. + const char *val; + int val_len; + ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len, + "start", &val, &val_len); + if (ret != JSV_STRING && ret != JSV_NUMBER) + { + err= ".start member must be present and be a scalar"; + goto error; + } + + // Read the "size" field. + const char *size; + int size_len; + ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len, + "size", &size, &size_len); + if (ret != JSV_NUMBER) + { + err= ".size member must be present and be a scalar"; + goto error; + } + + int conv_err; + char *size_end= (char*)size + size_len; + double size_d= my_strtod(size, &size_end, &conv_err); + if (conv_err) + { + err= ".size member must be a floating-point value"; + goto error; + } + cumulative_size += size_d; + + // Read the "ndv" field + const char *ndv; + int ndv_len; + ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len, + "ndv", &ndv, &ndv_len); + if (ret != JSV_NUMBER) + { + err= ".ndv member must be present and be a scalar"; + goto error; + } + char *ndv_end= (char*)ndv + ndv_len; + longlong ndv_ll= my_strtoll10(ndv, &ndv_end, &conv_err); + if (conv_err) + { + err= ".ndv member must be an integer value"; + goto error; + } + + const char *end_val; + int end_val_len; + ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len, + "end", &end_val, &end_val_len); + if (ret != JSV_NOTHING && ret != JSV_STRING && ret !=JSV_NUMBER) + { + err= ".end member must be a scalar"; + goto error; + } + if (ret != JSV_NOTHING) + last_bucket_end_endp.assign(end_val, end_val_len); + + buckets.push_back({std::string(val, val_len), NULL, cumulative_size, + ndv_ll}); + + if (buckets.size()) + { + auto& prev_bucket= buckets[buckets.size()-1]; + if (prev_bucket.ndv == 1) + prev_bucket.end_value= &prev_bucket.start_value; + else + prev_bucket.end_value= &buckets.back().start_value; } } - // n_buckets = n_bounds - 1 : - size= histogram_bounds.size()-1; - DBUG_RETURN(false); + buckets.back().end_value= &last_bucket_end_endp; + size= buckets.size(); + DBUG_RETURN(false); error: my_error(ER_JSON_HISTOGRAM_PARSE_FAILED, MYF(0), err, - je.s.c_str - (const uchar*)hist_data); + 12345); DBUG_RETURN(true); } @@ -257,7 +429,7 @@ double position_in_interval(Field *field, const uchar *key, uint key_len, { store_key_image_to_rec_no_null(field, left.data(), field->key_length()); double min_val_real= field->val_real(); - + store_key_image_to_rec_no_null(field, right.data(), field->key_length()); double max_val_real= field->val_real(); @@ -273,37 +445,44 @@ double position_in_interval(Field *field, const uchar *key, uint key_len, double Histogram_json_hb::point_selectivity(Field *field, key_range *endpoint, double avg_sel) { - double sel; - store_key_image_to_rec(field, (uchar *) endpoint->key, - field->key_length()); - const uchar *min_key = endpoint->key; + const uchar *key = endpoint->key; if (field->real_maybe_null()) - min_key++; - uint min_idx= find_bucket(field, min_key, false); - - uint max_idx= find_bucket(field, min_key, true); -#if 0 - // find how many buckets this value occupies - while ((max_idx + 1 < get_width() ) && - (field->key_cmp((uchar *)histogram_bounds[max_idx + 1].data(), min_key) == 0)) { - max_idx++; - } -#endif - if (max_idx > min_idx) + key++; + + // If the value is outside of the histogram's range, this will "clip" it to + // first or last bucket. + int idx= find_bucket(field, key, false); + + double sel; + + if (buckets[idx].ndv == 1 && + field->key_cmp((uchar*)buckets[idx].start_value.data(), key)) { - // value spans multiple buckets - double bucket_sel= 1.0/(get_width() + 1); - sel= bucket_sel * (max_idx - min_idx + 1); + // The bucket has a single value and it doesn't match! Use the global + // average. + sel= avg_sel; } else { - // the value fits within a single bucket - sel = MY_MIN(avg_sel, 1.0/get_width()); + /* + We get here when: + * The bucket has one value and this is the value we are looking for. + * The bucket has multiple values. Then, assume + */ + sel= (get_left_fract(idx) - buckets[idx].cum_fract) / buckets[idx].ndv; } return sel; } +double Histogram_json_hb::get_left_fract(int idx) +{ + if (!idx) + return 0.0; + else + return buckets[idx-1].cum_fract; +} + /* @param field The table field histogram is for. We don't care about the field's current value, we only need its virtual functions to @@ -317,7 +496,6 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, key_range *max_endp) { double min, max; - double width= 1.0 / histogram_bounds.size(); if (min_endp && !(field->null_ptr && min_endp->key[0])) { @@ -333,10 +511,12 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, // Find the leftmost bucket that contains the lookup value. // (If the lookup value is to the left of all buckets, find bucket #0) int idx= find_bucket(field, min_key, exclusive_endp); - double min_sel= position_in_interval(field, min_key, min_key_len, - histogram_bounds[idx], - histogram_bounds[idx+1]); - min= idx*width + min_sel*width; + double left_fract= get_left_fract(idx); + double sel= position_in_interval(field, min_key, min_key_len, + buckets[idx].start_value, + *buckets[idx].end_value); + + min= left_fract + sel * (buckets[idx].cum_fract - left_fract); } else min= 0.0; @@ -355,10 +535,11 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, } int idx= find_bucket(field, max_key, inclusive_endp); - double max_sel= position_in_interval(field, max_key, max_key_len, - histogram_bounds[idx], - histogram_bounds[idx+1]); - max= idx*width + max_sel*width; + double left_fract= get_left_fract(idx); + double sel= position_in_interval(field, max_key, max_key_len, + buckets[idx].start_value, + *buckets[idx].end_value); + max= left_fract + sel * (buckets[idx].cum_fract - left_fract); } else max= 1.0; @@ -375,23 +556,35 @@ void Histogram_json_hb::serialize(Field *field) /* - Find the histogram bucket that contains the value. + Find the rightmost histogram bucket such that "lookup_val $GT start_value". + + $GT is either '>' or '>=' depending on equal_is_less parameter. @param equal_is_less Controls what to do if a histogram bound is equal to the lookup_val. + + @detail + Possible cases: + 1. The regular case: the value falls into some bucket. + + 2. The value is less than the minimum of the first bucket + 3. The value is greater than the maximum of the last bucket + In these cases we "clip" to the first/last bucket. + + 4. The value hits the bucket boundary. Then, we need to know whether the + point of interest is to the left the constant, or to the right of it. */ int Histogram_json_hb::find_bucket(Field *field, const uchar *lookup_val, bool equal_is_less) { int low= 0; - int high= (int)histogram_bounds.size() - 1; - int middle; + int high= (int)buckets.size() - 1; while (low + 1 < high) { - middle= (low + high) / 2; - int res= field->key_cmp((uchar*)histogram_bounds[middle].data(), lookup_val); + int middle= (low + high) / 2; + int res= field->key_cmp((uchar*)buckets[middle].start_value.data(), lookup_val); if (!res) res= equal_is_less? -1: 1; if (res < 0) diff --git a/sql/opt_histogram_json.h b/sql/opt_histogram_json.h index a83e88a88c4..ed48d951a7f 100644 --- a/sql/opt_histogram_json.h +++ b/sql/opt_histogram_json.h @@ -20,6 +20,32 @@ An equi-height histogram which stores real values for bucket bounds. Handles @@histogram_type=JSON_HB + + Histogram format in JSON: + + { + "histogram_hb_v2": [ + { "start": "value", "size":nnn.nn, "ndv": nnn }, + ... + { "start": "value", "size":nnn.nn, "ndv": nnn, "end": "value"} + ] + } + + The histogram is an object with single member named "histogram_hb_v2". + The value of that member is an array of buckets. + Each bucket is an object with these members: + "start" - the first value in the bucket. + "size" - fraction of table rows that is contained in the bucket. + "ndv" - Number of Distinct Values in the bucket. + "end" - Optionally, the last value in the bucket. + + A bucket is a single-point bucket if it has ndv=1. + + Most buckets have no "end" member: the bucket is assumed to contain all + values up to the "start" of the next bucket. + + The exception is single-point buckets where last value is the same as the + first value. */ class Histogram_json_hb : public Histogram_base @@ -29,11 +55,29 @@ class Histogram_json_hb : public Histogram_base /* Collection-time only: collected histogram in the JSON form. */ std::string json_text; - // Array of histogram bucket endpoints in KeyTupleFormat. - std::vector<std::string> histogram_bounds; + struct Bucket + { + // The left endpoint in KeyTupleFormat. The endpoint is inclusive, this + // value is in this bucket. + std::string start_value; + + // The right endpoint. It is non-inclusive, except for the last bucket. + std::string *end_value; + + // Cumulative fraction: The fraction of table rows that fall into this + // and preceding buckets. + double cum_fract; + + // Number of distinct values in the bucket. + longlong ndv; + }; + + std::vector<Bucket> buckets; + + std::string last_bucket_end_endp; public: - static constexpr const char* JSON_NAME="histogram_hb_v1"; + static constexpr const char* JSON_NAME="histogram_hb_v2"; bool parse(MEM_ROOT *mem_root, Field *field, Histogram_type type_arg, const char *hist_data, size_t hist_data_len) override; @@ -80,6 +124,7 @@ class Histogram_json_hb : public Histogram_base } private: + double get_left_fract(int idx); int find_bucket(Field *field, const uchar *lookup_val, bool equal_is_less); };

1 0

[Commits] bfdc2ee6369: Fix compilation on windows
by psergey 07 Sep '21

07 Sep '21

revision-id: bfdc2ee636901e6f4c86a94e082092e5edc931a1 (mariadb-10.6.1-122-gbfdc2ee6369) parent(s): d43552edd3b32209aab3150069a4b4f29c9e2e7c author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-07 10:38:36 +0300 message: Fix compilation on windows --- sql/opt_histogram_json.cc | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 2817a257838..f1030662572 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -220,11 +220,11 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, static -void store_key_image_to_rec_no_null(Field *field, const char *ptr, uint len) +void store_key_image_to_rec_no_null(Field *field, const char *ptr, size_t len) { MY_BITMAP *old_map= dbug_tmp_use_all_columns(field->table, &field->table->write_set); - field->set_key_image((const uchar*)ptr, len); + field->set_key_image((const uchar*)ptr, (uint)len); dbug_tmp_restore_column_map(&field->table->write_set, old_map); }

1 0

[Commits] d43552edd3b: Correctly decode string field values for pos_in_interval_for_string call
by psergey 06 Sep '21

06 Sep '21

revision-id: d43552edd3b32209aab3150069a4b4f29c9e2e7c (mariadb-10.6.1-121-gd43552edd3b) parent(s): 8fc778f3e9cbc339d14653e9e035163e52a582cd author: Sergei Petrunia committer: Sergei Petrunia timestamp: 2021-09-06 18:18:08 +0300 message: Correctly decode string field values for pos_in_interval_for_string call --- mysql-test/main/statistics_json.result | 6 ++--- sql/field.h | 9 +++++++ sql/opt_histogram_json.cc | 47 ++++++++++++++++++++++------------ 3 files changed, 42 insertions(+), 20 deletions(-) diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result index aa7b7c08a31..102fcfff194 100644 --- a/mysql-test/main/statistics_json.result +++ b/mysql-test/main/statistics_json.result @@ -2452,12 +2452,12 @@ test t1_json a a-0 a-9 0.0000 3.0000 1.0000 100 JSON_HB { } explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 60.27 Using where +1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 59.41 Using where Warnings: Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` between 'a-3a' and 'zzzzzzzzz' analyze select * from t1_json where a between 'a-3a' and 'zzzzzzzzz'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 60.27 60.00 Using where +1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 59.41 60.00 Using where explain extended select * from t1_json where a < 'b-1a'; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 99.01 Using where @@ -3179,7 +3179,7 @@ id select_type table type possible_keys key key_len ref rows r_rows filtered r_f 1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 25.49 25.52 Using where analyze select * from Country use index () where Code < 'BBC'; id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 5.88 7.11 Using where +1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 7.84 7.11 Using where set histogram_type=@save_histogram_type; set histogram_size=@save_histogram_size; DROP SCHEMA world; diff --git a/sql/field.h b/sql/field.h index e4224fc1e51..2db81c61b75 100644 --- a/sql/field.h +++ b/sql/field.h @@ -1511,11 +1511,20 @@ class Field: public Value_source if (null_ptr) null_ptr=ADD_TO_PTR(null_ptr,ptr_diff,uchar*); } + + /* + Copy the Field's value to buff. The value will be in table->record[] + format. + */ void get_image(uchar *buff, uint length, CHARSET_INFO *cs) const { get_image(buff, length, ptr, cs); } virtual void get_image(uchar *buff, uint length, const uchar *ptr_arg, CHARSET_INFO *cs) const { memcpy(buff,ptr_arg,length); } + + /* + Set Field's value to the value in *buf. + */ virtual void set_image(const uchar *buff,uint length, CHARSET_INFO *cs) { memcpy(ptr,buff,length); } diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 5f4e0eca585..2817a257838 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -220,43 +220,48 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field, static -void store_key_image_to_rec_no_null(Field *field, const uchar *ptr) +void store_key_image_to_rec_no_null(Field *field, const char *ptr, uint len) { MY_BITMAP *old_map= dbug_tmp_use_all_columns(field->table, &field->table->write_set); - field->set_key_image(ptr, field->key_length()); + field->set_key_image((const uchar*)ptr, len); dbug_tmp_restore_column_map(&field->table->write_set, old_map); } static -double position_in_interval(Field *field, const uchar *key, +double position_in_interval(Field *field, const uchar *key, uint key_len, const std::string& left, const std::string& right) { double res; if (field->pos_through_val_str()) { - uint32 min_len= uint2korr(left.data()); - uint32 max_len= uint2korr(right.data()); - uint32 midp_len= uint2korr(key); + StringBuffer<64> buf1, buf2, buf3; + String empty_buf1, empty_buf2, empty_buf3; + + store_key_image_to_rec_no_null(field, left.data(), left.size()); + String *min_str= field->val_str(&buf1, &empty_buf1); + + store_key_image_to_rec_no_null(field, right.data(), right.size()); + String *max_str= field->val_str(&buf2, &empty_buf2); + + store_key_image_to_rec_no_null(field, (const char*)key, key_len); + String *midp_str= field->val_str(&buf3, &empty_buf3); res= pos_in_interval_for_string(field->charset(), - key + HA_KEY_BLOB_LENGTH, - midp_len, - (const uchar*)left.data() + HA_KEY_BLOB_LENGTH, - min_len, - (const uchar*)right.data() + HA_KEY_BLOB_LENGTH, - max_len); + (const uchar*)midp_str->ptr(), midp_str->length(), + (const uchar*)min_str->ptr(), min_str->length(), + (const uchar*)max_str->ptr(), max_str->length()); } else { - store_key_image_to_rec_no_null(field, (const uchar*)left.data()); + store_key_image_to_rec_no_null(field, left.data(), field->key_length()); double min_val_real= field->val_real(); - store_key_image_to_rec_no_null(field, (const uchar*)right.data()); + store_key_image_to_rec_no_null(field, right.data(), field->key_length()); double max_val_real= field->val_real(); - store_key_image_to_rec_no_null(field, key); + store_key_image_to_rec_no_null(field, (const char*)key, field->key_length()); double midp_val_real= field->val_real(); res= pos_in_interval_for_double(midp_val_real, min_val_real, max_val_real); @@ -318,13 +323,17 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, { bool exclusive_endp= (min_endp->flag == HA_READ_AFTER_KEY)? true: false; const uchar *min_key= min_endp->key; + uint min_key_len= min_endp->length; if (field->real_maybe_null()) + { min_key++; + min_key_len--; + } // Find the leftmost bucket that contains the lookup value. // (If the lookup value is to the left of all buckets, find bucket #0) int idx= find_bucket(field, min_key, exclusive_endp); - double min_sel= position_in_interval(field, (const uchar*)min_key, + double min_sel= position_in_interval(field, min_key, min_key_len, histogram_bounds[idx], histogram_bounds[idx+1]); min= idx*width + min_sel*width; @@ -338,11 +347,15 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, DBUG_ASSERT(!(field->null_ptr && max_endp->key[0])); bool inclusive_endp= (max_endp->flag == HA_READ_AFTER_KEY)? true: false; const uchar *max_key= max_endp->key; + uint max_key_len= max_endp->length; if (field->real_maybe_null()) + { max_key++; + max_key_len--; + } int idx= find_bucket(field, max_key, inclusive_endp); - double max_sel= position_in_interval(field, (const uchar*)max_key, + double max_sel= position_in_interval(field, max_key, max_key_len, histogram_bounds[idx], histogram_bounds[idx+1]); max= idx*width + max_sel*width;

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