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MDEV-7004 - Merge scalability fixes from 10.0-power

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Preallocate dynamic array on THD mem_root to avoid expensive malloc.
This commit is contained in:
Sergey Vojtovich
2014-12-04 17:42:32 +04:00
parent 070a6e7a89
commit eaa8c154e8
1 changed files with 3 additions and 2 deletions
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5
sql/sql_select.cc
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@ -5247,8 +5247,9 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
/* set a barrier for the array of SARGABLE_PARAM */
(*sargables)[0].field= 0;
if (my_init_dynamic_array(keyuse,sizeof(KEYUSE),20,64,
MYF(MY_THREAD_SPECIFIC)))
if (my_init_dynamic_array2(keyuse, sizeof(KEYUSE),
thd->alloc(sizeof(KEYUSE) * 20), 20, 64,
MYF(MY_THREAD_SPECIFIC)))
return TRUE;
if (cond)