6fd5071909
All these code paths use their own entry point when starting parallel workers, but failed to set a query ID, even if they set a text query. Hence, this data would be missed in pg_stat_activity for the worker processes. The main entry point for parallel query processing, ParallelQueryMain(), is already doing that by saving its query ID in a dummy PlannedStmt, but not the others. The code is changed so as the query ID of these queries is set in their shared state, and reported back once the parallel workers start. Some tests are added to show how the failures can happen for btree and BRIN with a parallel build enforced, which are able to trigger a failure in an assertion added by 24f520594809 in the recovery TAP test 027_stream_regress.pl where pg_stat_statements is always loaded. In this case, the executor path was taken because the index expression needs to be flattened when building its IndexInfo. Alexander Lakhin has noticed the problem in btree, and I have noticed that the issue was more spread. This is arguably a bug, but nobody has complained about that until now, so no backpatch is done out of caution. If folks would like to see a backpatch, well, let me know. Reported-by: Alexander Lakhin Reviewed-by: Sami Imseih Discussion: https://postgr.es/m/cf3547c1-498a-6a61-7b01-819f902a251f@gmail.com
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
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