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A cleanup for MDEV-18333 Slow_queries count doesn't increase when slow_query_log is turned off

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thd->lex->m_sql_cmd was not cleared between queries.
log_slow_query() could crash (when running mtr --ps) because of this.
This commit is contained in:
Alexander Barkov 2019-03-06 17:08:03 +04:00
parent 485dcb07d1
commit 26f0d72a3f
1 changed files with 5 additions and 0 deletions
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5
sql/sql_parse.cc
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@ -1989,6 +1989,11 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
dec_thread_running();
thd->packet.shrink(thd->variables.net_buffer_length); // Reclaim some memory
thd->reset_kill_query(); /* Ensure that killed_errmsg is released */
/*
LEX::m_sql_cmd can point to Sql_cmd allocated on thd->mem_root.
Unlink it now, before freeing the root.
*/
thd->lex->m_sql_cmd= NULL;
free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
#if defined(ENABLED_PROFILING)