database/mariadb-columnstore-engine
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Code Activity

parse_item() in execplan code now always get an actual GWI structure

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to avoid accedental crashes.

Add check for Conversion of Big IN Predicates Into Subqueries optimization
conditions.

Enabled derivedTableOptimization() for group by and derived handlers.

Disabled Conversion of Big IN Predicates Into Subqueries optimization.

Disabled most of optimizer_flags for now.

RowGroup + operator now correctly sets useStringTable flag that
instructs code to check StringStore instead of plain data buffer.
This commit is contained in:
Roman Nozdrin
2019-07-26 23:39:51 +03:00
committed by Gagan Goel
parent 7d5275e1bd
commit d62b66ecf7
8 changed files with 119 additions and 44 deletions
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24
dbcon/mysql/ha_mcs_pushdown.cpp
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@ -17,6 +17,29 @@
// ha_calpont.cpp includes this file.
void mutate_optimizer_flags(THD *thd_)
{
// MCOL-2178 Disable all optimizer flags as it was in the fork.
// CS restores it later in SH::scan_end() and in case of an error
// in SH::scan_init()
set_original_optimizer_flags(thd_->variables.optimizer_switch, thd_);
thd_->variables.optimizer_switch = OPTIMIZER_SWITCH_IN_TO_EXISTS |
OPTIMIZER_SWITCH_EXISTS_TO_IN |
OPTIMIZER_SWITCH_COND_PUSHDOWN_FOR_DERIVED;
}
void restore_optimizer_flags(THD *thd_)
{
// MCOL-2178 restore original optimizer flags after SH, DH
ulonglong orig_flags = get_original_optimizer_flags(thd_);
if (orig_flags)
{
thd_->variables.optimizer_switch = orig_flags;
set_original_optimizer_flags(0, thd_);
}
}
/*@brief check_walk - It traverses filter conditions*/
/************************************************************
* DESCRIPTION:
@ -508,6 +531,7 @@ create_columnstore_select_handler(THD* thd, SELECT_LEX* select_lex)
if (!unsupported_feature)
{
handler = new ha_columnstore_select_handler(thd, select_lex);
mutate_optimizer_flags(thd);
}
return handler;