database/mariadb-columnstore-engine
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MCOL-2178 CS now sets optimizer flags like it did in the fork-era.

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This happens in external_lock() whilst locking the table.

Fixes LIMIT=1 optimization for EXISTS_SUBS subqueries.

external_lock() contains if condition that gives false positive
for SH + pushed conditions.

external_lock() now resets in_subquery_conversion_threshold
variable that governs IN_INTO_SUBQUERY optimization for
queries run in table mode.

external_lock() now purges dynamicall allocated condInfo for
SH and DH execution path.

Commented out UNION check b/c if condition gives false positives
and silently enables table mode execution for queries w/o
UNION.
This commit is contained in:
Roman Nozdrin
2019-09-13 06:29:55 -05:00
committed by root
parent 0852e316f8
commit 0c58f10d12
7 changed files with 42 additions and 29 deletions
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2
dbcon/mysql/ha_in_sub.cpp
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@ -148,7 +148,7 @@ execplan::ParseTree* InSub::transform()
gwi.tbList.insert(gwi.tbList.begin(), fGwip.tbList.begin(), fGwip.tbList.end());
gwi.derivedTbList.insert(gwi.derivedTbList.begin(), fGwip.derivedTbList.begin(), fGwip.derivedTbList.end());
if (getSelectPlan(gwi, *(fSub->get_select_lex()), csep) != 0)
if (getSelectPlan(gwi, *(fSub->get_select_lex()), csep, false, true) != 0)
{
fGwip.fatalParseError = true;