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febda72f62
* Make index merge quick selects code allow perform several scans.
* Delay additional handler objects creation till row retrieval is started.
include/queues.h:
Added trivial queue_remove_all macro
mysql-test/r/index_merge.result:
Testcase for BUG#4177
mysql-test/t/index_merge.test:
Testcase for BUG#4177
sql/opt_range.cc:
Fix for BUG#4177:
* For any quick select, row retrieval can be performed several times. Now all index_merge quick selects code handles such cases properly.
* In QUICK_INDEX_MERGE_SELECT we use one handler object for all merged scans, and it was possible that in
destructor several cleanup functions were called
* Additionally
- Removed redundant QUICK_INDEX_MERGE_SELECT members.
- Now QUICK_ROR_*_SELECTs create additional handler objects only when row retrieval is started
So if join optimizer chooses other access method, we don't create/delete handlers.
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