Planner, check if can use consider HASH for groupings (src/backend/optimizer/plan/planner.c)

[Ranier Vilela]

Hi,

In case gd->any_hashable is FALSE, grouping_is_hashable is never called.
In this case, the planner could use HASH for groupings, but will never know.

Apparently gd pointer, will never be NULL there, verified with Assert(gd !=
NULL).

regards,
Ranier Vilela

v1-0001-check_grouping_is_hashable.patch
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