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Tom Lane 3eea7a0c97 Simplify executor's determination of whether to use parallelism. ... Our parallel-mode code only works when we are executing a query in full, so ExecutePlan must disable parallel mode when it is asked to do partial execution. The previous logic for this involved passing down a flag (variously named execute_once or run_once) from callers of ExecutorRun or PortalRun. This is overcomplicated, and unsurprisingly some of the callers didn't get it right, since it requires keeping state that not all of them have handy; not to mention that the requirements for it were undocumented. That led to assertion failures in some corner cases. The only state we really need for this is the existing QueryDesc.already_executed flag, so let's just put all the responsibility in ExecutePlan. (It could have been done in ExecutorRun too, leading to a slightly shorter patch -- but if there's ever more than one caller of ExecutePlan, it seems better to have this logic in the subroutine than the callers.) This makes those ExecutorRun/PortalRun parameters unnecessary. In master it seems okay to just remove them, returning the API for those functions to what it was before parallelism. Such an API break is clearly not okay in stable branches, but for them we can just leave the parameters in place after documenting that they do nothing. Per report from Yugo Nagata, who also reviewed and tested this patch. Back-patch to all supported branches. Discussion: https://postgr.es/m/20241206062549.710dc01cf91224809dd6c0e1@sraoss.co.jp		9 months ago
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expected	Set query ID for inner queries of CREATE TABLE AS and DECLARE	11 months ago
sql	Track more precisely query locations for nested statements	11 months ago
t	Update copyright for 2024	2 years ago
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Makefile	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
meson.build	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
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pg_stat_statements--1.4--1.5.sql	Default monitoring roles	9 years ago
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pg_stat_statements--1.5--1.6.sql	Revoke pg_stat_statements_reset() permissions	7 years ago
pg_stat_statements--1.6--1.7.sql	Extend pg_stat_statements_reset to reset statistics specific to a	7 years ago
pg_stat_statements--1.7--1.8.sql	Change the display of WAL usage statistics in Explain.	5 years ago
pg_stat_statements--1.8--1.9.sql	Merge v1.10 of pg_stat_statements into v1.9	4 years ago
pg_stat_statements--1.9--1.10.sql	Add JIT counters to pg_stat_statements	3 years ago
pg_stat_statements--1.10--1.11.sql	Track statement entry timestamp in contrib/pg_stat_statements	2 years ago
pg_stat_statements--1.11--1.12.sql	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
pg_stat_statements.c	Simplify executor's determination of whether to use parallelism.	9 months ago
pg_stat_statements.conf	Revert "pg_stat_statements: Add coverage for entry_dealloc()"	2 years ago
pg_stat_statements.control	pg_stat_statements: Add columns to track parallel worker activity	11 months ago