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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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sql/opt_range.cc
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@@ -7039,7 +7039,7 @@ SEL_TREE *Item_func_in::get_func_mm_tree(RANGE_OPT_PARAM *param,
per-statement mem_root (while thd->mem_root is currently pointing
to mem_root local to range optimizer).
*/
Item *value_item= array->create_item();
Item *value_item= array->create_item(param->thd);
param->thd->mem_root= tmp_root;
if (array->count > NOT_IN_IGNORE_THRESHOLD || !value_item)