Sergey Petrunya 00475d40d1 MDEV-7118: Anemometer stop working after upgrade to from... ...

When the optimizer considers an option to use Loose Scan, it should 
still consider UNIQUE keys (Previously, MDEV-4120 disabled loose scan
for all kinds of unique indexes. That was wrong)

However, we should not use Loose Scan when trying to satisfy 
 "SELECT DISTINCT col1, col2, .. colN"
when using an index defined as UNIQU(col1, col2, ... colN).

2014-11-19 17:14:49 +03:00

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