Only aggregate selected columns

[glamax13]

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Description

Aggregation can complicate the query quite a bit and significantly slows down the query.
I would have like it if only "usefull" aggregate columns where calculated.

I understand that filters and sort could be applied even on invisible columns so this would break current behaviour.
A global setting to enable and disable this behaviour could be preferable and i don't know how "hiddenColumn" should interract with this.
In my case the potential performance gains justify this feature usefullness but i let you be the juge on this matter.

This change is small enough that i didn't feel the need to add test or documentation changes.
Let me know if they are required and if other matters should be taken into concideration.

Thank you for your time