Hi Alexey, I was looking at Json_table_nested_path::set_position(), wondering why does it have an assignment np->m_null= TRUE; but doesn't clear the NULL values and trying to come up with an example of this going wrong when I've hit this crash: select * from json_table( '[ {"name": "X", "colors":["blue"], "sizes": [1,2,3,4], "prices" : [10,20]}, {"name": "Y", "colors":["red"], "sizes": [10,11], "prices" : [100,200,300]} ]', '$[*]' columns ( seq0 for ordinality, name varchar(4) path '$.name', nested path '$.colors[*]' columns ( seq1 for ordinality, color text path '$' ), nested path '$.sizes[*]' columns ( seq2 for ordinality, size int path '$' ), nested path '$.prices[*]' columns ( seq3 for ordinality, price int path '$' ) ) ) as T order by seq0, name; Note this==NULL: (gdb) wher #0 0x00005555560edf72 in Json_table_nested_path::set_position (this=0x0, j_start=0x7ffeb0016e68 "[ \n {\"name\": \"X\", \n \"colors\":[\"blue\"], \"sizes\": [1,2,3,4], \"prices\" : [10,20]},\n {\"name\": \"Y\", \n \"colors\":[\"red\"], \"sizes\": [10,11], \"prices\" : [100,200,300]}\n]", j_end=0x7ffeb0016f12 "", pos=0x7ffeb0035e51 "\245\245\245\245\245\245\245\245\006") at /home/psergey/dev-git2/10.6-hf-review6/sql/table_function.cc:239 #1 0x00005555560ee12f in Json_table_nested_path::set_position (this=0x7ffeb0017060, j_start=0x7ffeb0016e68 "[ \n {\"name\": \"X\", \n \"colors\":[\"blue\"], \"sizes\": [1,2,3,4], \"prices\" : [10,20]},\n {\"name\": \"Y\", \n \"colors\":[\"red\"], \"sizes\": [10,11], \"prices\" : [100,200,300]}\n]", j_end=0x7ffeb0016f12 "", pos=0x7ffeb0035e48 "") at /home/psergey/dev-git2/10.6-hf-review6/sql/table_function.cc:262 #2 0x00005555560ee9f0 in ha_json_table::rnd_pos (this=0x7ffeb0014f00, buf=0x7ffeb0025570 "\377", pos=0x7ffeb0035e48 "") at /home/psergey/dev-git2/10.6-hf-review6/sql/table_function.cc:434 #3 0x00005555561ca6a4 in handler::ha_rnd_pos (this=0x7ffeb0014f00, buf=0x7ffeb0025570 "\377", pos=0x7ffeb0035e48 "") at /home/psergey/dev-git2/10.6-hf-review6/sql/handler.cc:3101 #4 0x00005555563852e3 in rr_from_pointers (info=0x7ffeb001f9e0) at /home/psergey/dev-git2/10.6-hf-review6/sql/records.cc:615 #5 0x0000555555da4a75 in READ_RECORD::read_record (this=0x7ffeb001f9e0) at /home/psergey/dev-git2/10.6-hf-review6/sql/records.h:81 #6 0x0000555555ee1876 in join_init_read_record (tab=0x7ffeb001f918) at /home/psergey/dev-git2/10.6-hf-review6/sql/sql_select.cc:21644 #7 0x0000555555edf35a in sub_select (join=0x7ffeb001d948, join_tab=0x7ffeb001f918, end_of_records=false) at /home/psergey/dev-git2/10.6-hf-review6/sql/sql_select.cc:20666 #8 0x0000555555ede8e6 in do_select (join=0x7ffeb001d948, procedure=0x0) at /home/psergey/dev-git2/10.6-hf-review6/sql/sql_select.cc:20216 #9 0x0000555555eb24e7 in JOIN::exec_inner (this=0x7ffeb001d948) at /home/psergey/dev-git2/10.6-hf-review6/sql/sql_select.cc:4484 #10 0x0000555555eb1613 in JOIN::exec (this=0x7ffeb001d948) at /home/psergey/dev-git2/10.6-hf-review6/sql/sql_select.cc:4264 Please fix. BR Sergei -- Sergei Petrunia, Software Developer MariaDB Corporation | Skype: sergefp | Blog: http://petrunia.net