On Fri, Mar 31, 2017 at 10:26 PM, Andres Freund <and...@anarazel.de> wrote:
> Hi,
> 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
> https://coverage.postgresql.org/src/backend/executor/nodeGatherMerge.c.gcov.html
> we don't actually merge anything (heap_compare_slots is not exercised).

Sounds reasonable.

> 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.

Yeah, I don't know.  We could alternatively try to move that to some
common location and merge the two implementations.  I'm not sure
exactly where, though.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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