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Michael Paquier 499edb0974 Track more precisely query locations for nested statements ... Previously, a Query generated through the transform phase would have unset stmt_location, tracking the starting point of a query string. Extensions relying on the statement location to extract its relevant parts in the source text string would fallback to use the whole statement instead, leading to confusing results like in pg_stat_statements for queries relying on nested queries, like: - EXPLAIN, with top-level and nested query using the same query string, and a query ID coming from the nested query when the non-top-level entry. - Multi-statements, with only partial portions of queries being normalized. - COPY TO with a query, SELECT or DMLs. This patch improves things by keeping track of the statement locations and propagate it to Query during transform, allowing PGSS to only show the relevant part of the query for nested query. This leads to less bloat in entries for non-top-level entries, as queries can now be grouped within the same (toplevel, queryid) duos in pg_stat_statements. The result gives a stricter one-one mapping between query IDs and its query strings. The regression tests introduced in 45e0ba30fc produce differences reflecting the new logic. Author: Anthonin Bonnefoy Reviewed-by: Michael Paquier, Jian He Discussion: https://postgr.es/m/CAO6_XqqM6S9bQ2qd=75W+yKATwoazxSNhv5sjW06fjGAtHbTUA@mail.gmail.com		11 months ago
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cleanup.sql	Refactor tests of pg_stat_statements for planning, utility and level tracking	3 years ago
cursors.sql	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
dml.sql	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
entry_timestamp.sql	Track statement entry timestamp in contrib/pg_stat_statements	2 years ago
extended.sql	Add missing query ID reporting in extended query protocol	12 months ago
level_tracking.sql	pg_stat_statements: Add tests for nested queries with level tracking	11 months ago
oldextversions.sql	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
parallel.sql	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
planning.sql	Track more precisely query locations for nested statements	11 months ago
privileges.sql	pg_stat_statements: Add regression test for privilege handling.	1 year ago
select.sql	Improve parser's reporting of statement start locations.	11 months ago
user_activity.sql	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
utility.sql	pg_stat_statements: Expand tests for SET statements	12 months ago
wal.sql	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago