Commit 76b6ee3

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Improve planner's choices about when to use hashing vs sorting for DISTINCT.

The previous coding missed a bet by sometimes picking the "sorted" path from query_planner even though hashing would be preferable. To fix, we have to be willing to make the choice sooner. This contorts things a little bit, but I thought of a factorization that makes it not too awful.

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src/backend/optimizer/plan
- planner.c

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