Evgeny Potemkin cc01fc3f5f Bug#50843: Filesort used instead of clustered index led to ...

performance degradation.

Filesort + join cache combination is preferred to full index scan because it
is usually faster. But it's not the case when the index is clustered one.

Now test_if_skip_sort_order function prefers filesort only if index isn't
clustered.

2010-02-26 14:17:00 +03:00

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