Varun Gupta 706fb790bc MDEV-10927: Crash When Using sort_union Optimization ...

In file sql/filesort.cc,when merge_buffers() is called then
- queue_remove(&queue,0) is called
- For the function queue_remove there is assertion states that the element to be removed should have index >=1
- this is causing the assertion to fail.

Fixed by removing the top element.

2016-12-22 15:51:37 +05:30

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