[TYPO3-core] RFC #13273: Bug: Caching framework sub-select is slow because mysql does not use indexes on outer query

[Steffen Kamper]

Hi Christian,

+1 on reading and testing v2. I didn't made performance tests, but 
functionality. But theory of indices in subselects is clear.

Also unit test works.

So go ahead, thanks for this performance boost!

vg Steffen