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Re-commit in git:

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MDEV-406: ANALYZE $stmt
- Ported the old patch to new explain code
- New SQL syntax (ANALYZE $stmt)
- ANALYZE UPDATE/DELETE is now supported (because EXPLAIN UPDATE/DELETE is supported)
- Basic counters are calculated for basic kinds of queries
  (still need to see what happens with join buffer, ORDER BY...LIMIT queries, etc)
This commit is contained in:
Sergei Petrunia
2014-05-27 20:13:17 +04:00
parent 5a61516afd
commit eaba1ba4a5
13 changed files with 239 additions and 58 deletions
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28
sql/sql_parse.cc
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@ -5233,7 +5233,8 @@ static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
top-level LIMIT
*/
result->reset_offset_limit();
thd->lex->explain->print_explain(result, thd->lex->describe);
thd->lex->explain->print_explain(result, thd->lex->describe,
thd->lex->analyze_stmt);
if (lex->describe & DESCRIBE_EXTENDED)
{
char buff[1024];
@ -5257,12 +5258,33 @@ static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
}
else
{
if (!result && !(result= new select_send()))
return 1; /* purecov: inspected */
//psergey-todo: ANALYZE should hook in here...
select_result *save_result;
if (lex->analyze_stmt)
{
save_result= result;
result= new select_send_analyze();
}
else
{
if (!result && !(result= new select_send()))
return 1; /* purecov: inspected */
}
query_cache_store_query(thd, all_tables);
res= handle_select(thd, lex, result, 0);
if (result != lex->result)
delete result;
if (lex->analyze_stmt)
{
result= save_result;
if (!result && !(result= new select_send()))
return 1;
thd->lex->explain->send_explain(thd);
if (result != lex->result)
delete result;
}
}
}
/* Count number of empty select queries */