I wrote:
> So, apparently somebody wrote ExecReScanGatherMerge, but never bothered
> to plug it into ExecReScan. From which we may draw depressing conclusions
> about how much it's been tested.
While I'm bitching ... the code coverage report at
https://coverage.postgresql.org/src/backend/executor/nodeGatherMerge.c.gcov.html
also leaves one with less than a warm feeling about the extent of test
coverage on this file. heap_compare_slots isn't invoked even once?
regards, tom lane
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