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(parent: 0b1b503) | patch

Fix partial aggregation for the case of a degenerate GROUP BY clause.

Fix partial aggregation for the case of a degenerate GROUP BY clause.

The plan generated for sorted partial aggregation with "GROUP BY constant"
included a Sort node with no sort keys, which the executor does not like.

Per report from Steve Randall. I'd add a regression test case if I could
think of a compact one, but it doesn't seem worth expending lots of cycles
on.

Report: <CABVd52UAdGXpg_rCk46egpNKYdXOzCjuJ1zG26E2xBe_8bj+Fg@mail.gmail.com>

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