Sergei Golubchik 27bc13b7a2 MDEV-12136 SELECT COUNT(DISTINCT) returns the wrong value when tmp_table_size is limited ...

Same MDEV, second bug.
Merge buffer must fit at least MERGEBUFF2 (that is, 15) key values.
Because merge_index() can merge that many buffers, and
merge_many_buff() leaves that many buffers unmerged.

2017-07-13 11:23:54 +02:00

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