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MDEV-8010 - Avoid sql_alloc() in Items (Patch #1)

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Added mandatory thd parameter to Item (and all derivative classes) constructor.
Added thd parameter to all routines that may create items.
Also removed "current_thd" from Item::Item. This reduced number of
pthread_getspecific() calls from 290 to 177 per OLTP RO transaction.
This commit is contained in:
Sergey Vojtovich
2015-08-11 11:18:38 +04:00
parent 4374da63f0
commit 31e365efae
71 changed files with 2724 additions and 2474 deletions
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2
sql/sql_derived.cc
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@ -446,7 +446,7 @@ bool mysql_derived_merge(THD *thd, LEX *lex, TABLE_LIST *derived)
if (derived->get_unit()->prepared)
{
Item *expr= derived->on_expr;
expr= and_conds(expr, dt_select->join ? dt_select->join->conds : 0);
expr= and_conds(thd, expr, dt_select->join ? dt_select->join->conds : 0);
if (expr && (derived->prep_on_expr || expr != derived->on_expr))
{
derived->on_expr= expr;