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BUG#1000051: Query with simple join and ORDER BY takes thousands times longer when run with ICP

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- Disable IndexConditionPushdown for reverse scans.
This commit is contained in:
Sergey Petrunya
2012-05-23 11:46:40 +04:00
parent 02bdc608b5
commit 1d3ba8a791
9 changed files with 58 additions and 7 deletions
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17
sql/sql_select.cc
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@ -18548,6 +18548,15 @@ check_reverse_order:
tab->limit= 0;
goto use_filesort; // Reverse sort failed -> filesort
}
/*
Cancel Pushed Index Condition, as it doesn't work for reverse scans.
*/
if (tab->select && tab->select->pre_idx_push_select_cond)
{
tab->set_cond(tab->select->pre_idx_push_select_cond);
tab->table->file->cancel_pushed_idx_cond();
}
select->quick= tmp;
}
else if (tab->type != JT_NEXT && tab->type != JT_REF_OR_NULL &&
@ -18561,6 +18570,14 @@ check_reverse_order:
*/
tab->read_first_record= join_read_last_key;
tab->read_record.read_record= join_read_prev_same;
/*
Cancel Pushed Index Condition, as it doesn't work for reverse scans.
*/
if (tab->select && tab->select->pre_idx_push_select_cond)
{
tab->set_cond(tab->select->pre_idx_push_select_cond);
tab->table->file->cancel_pushed_idx_cond();
}
}
}
else if (select && select->quick)