Horton

Add SETTINGS option to EXPLAIN, to print modified settings.

Tomas Vondra <tomas.vondra@postgresql.org>

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Commit: ea569d64ac7174d3fe657e3e682d11053ecf1866
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2019-04-03T22:04:31Z
Releases: 12.0 
Add SETTINGS option to EXPLAIN, to print modified settings.

Query planning is affected by a number of configuration options, and it
may be crucial to know which of those options were set to non-default
values.  With this patch you can say EXPLAIN (SETTINGS ON) to include
that information in the query plan.  Only options affecting planning,
with values different from the built-in default are printed.

This patch also adds auto_explain.log_settings option, providing the
same capability in auto_explain module.

Author: Tomas Vondra
Reviewed-by: Rafia Sabih, John Naylor
Discussion: https://postgr.es/m/e1791b4c-df9c-be02-edc5-7c8874944be0@2ndquadrant.com

Files

PathChange+/−
contrib/auto_explain/auto_explain.c modified +13 −0
doc/src/sgml/auto-explain.sgml modified +18 −0
doc/src/sgml/ref/explain.sgml modified +12 −0
src/backend/commands/explain.c modified +76 −0
src/backend/utils/misc/guc.c modified +210 −52
src/include/commands/explain.h modified +1 −0
src/include/utils/guc.h modified +2 −0
src/include/utils/guc_tables.h modified +1 −0

Documentation touched

Discussion