Hi, Aleksey! I'm reviewing it separately from other commits in the branch, because it looks to be functionally independent from, say, MDEV-16029 mysqldump: dump and restore historical data and doesn't have to wait for the latter to be pushed first. I think I was able to guess what the patch would look like, if you'd apply it to vanilla 10.7 without MDEV-16029. But just to be sure, please, let me look it over again after the cherry-pick. Otherwise no comments code-wise. A couple of comments related to naming, see below. On Aug 15, Aleksey Midenkov wrote:

revision-id: a19495728de (versioning-1.0.5-45-ga19495728de) parent(s): be4605ae086 author: Aleksey Midenkov committer: Aleksey Midenkov timestamp: 2018-07-19 14:47:35 +0300 message:

MDEV-16355 Add option for mysqldump to read data as of specific timestamp from system-versioned tables

mysqldump changes:

* --asof-timestamp option specifies historical point;

"asof" isn't a word. I'd suggest --as-of-timestamp or simply --as-of

* with --dump-history it dumps all prior history, without it dumps only single point in time; * query forging protection for --asof-timestamp parameter.

diff --git a/client/mysqldump.c b/client/mysqldump.c index eee12555271..f426e8c58ef 100644 --- a/client/mysqldump.c +++ b/client/mysqldump.c @@ -1099,6 +1102,13 @@ static int get_options(int *argc, char ***argv) my_progname_short); return(EX_USAGE); } + if (opt_asof_timestamp && strchr(opt_asof_timestamp, '\'')) + { + fprintf(stderr, + "%s: --asof-timestamp wrong argument!\n", + my_progname_short);

May be, use the wording that is closer to the error one would get from any other invalid character, like, if one would do --asof-timestamp='!@#$%' That is, instead of "wrong argument", something like fprintf(stderr, "%s: Incorrect DATETIME value: '%s'\n", opt_asof_timestamp, my_progname_short); Because MariaDB [test]> select timestamp'2010!@#$%'; ERROR 1525 (HY000): Incorrect DATETIME value: '2010!@#$%'

+ return(EX_USAGE); + } if (strcmp(default_charset, charset_info->csname) && !(charset_info= get_charset_by_csname(default_charset, MY_CS_PRIMARY, MYF(MY_WME))))

Regards, Sergei VP of MariaDB Server Engineering and security@mariadb.org