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When restoring GUCs in parallel workers, show an error context.

Thomas Munro <tmunro@postgresql.org>

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Commit: 6737111a7ae1fac6b4781250be7c0719c5a7ed48
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2019-10-17T00:58:58Z
Releases: 11.6 
When restoring GUCs in parallel workers, show an error context.

Otherwise it can be hard to see where an error is coming from, when
the parallel worker sets all the GUCs that it received from the
leader.  Bug #15726.  Back-patch to 9.5, where RestoreGUCState()
appeared.

Reported-by: Tiago Anastacio
Reviewed-by: Daniel Gustafsson, Tom Lane
Discussion: https://postgr.es/m/15726-6d67e4fa14f027b3%40postgresql.org

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src/backend/utils/misc/guc.c modified +29 −0

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