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Committer:
Sergey Petrunya
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Date:
2011-10-31 11:07:43 UTC
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Revision ID:
psergey@askmonty.org-20111031110743-4gc6z08bd0t4bmhj
BUG#882994: Crash in QUICK_RANGE_SELECT::reset with derived_with_keys
- The bug was caused by the following scenario:
= a quick select is created with get_quick_select_for_ref. The quick
select refers to temporary (derived) table. It saves table->file, which
refers to a ha_heap object.
= When temp table is populated, ha_heap reaches max. size and is converted
to a ha_myisam. However, quick->file remains pointing to where ha_heap
was.
= Attempt to use the quick select causes crash.
- Fixed by introducing QUICK_SELECT_I::replace_handler(). Note that it will
not work for index_merge quick selects. Which is fine, because these
quick selects are never created for derived tables.