On 2017-04-01 01:22:14 +0000, Robert Haas wrote:
> Avoid GatherMerge crash when there are no workers.

I think the gather merge code needs a bit more test coverage (sorry to
make this a larger theme today).  As shown by
we don't actually merge anything (heap_compare_slots is not exercised).

I btw also wonder if it's good that we have a nearly identical copy of
heap_compare_slots and a bunch of the calling code in both
nodeMergeAppend.c and nodeGatherMerge.c.  On the other hand, it's not
heavily envolving code.

- Andres

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