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Álvaro Herrera b1635c1666 pg_stat_statements: Fix handling of duplicate constant locations ... Two or more constants can have the same location. We handled this correctly for non squashed constants, but failed to do it if squashed (resulting in out-of-bounds memory access), because the code structure became broken by commit 0f65f3eec478: we failed to update 'last_loc' correctly when skipping these squashed constants. The simplest fix seems to be to get rid of 'last_loc' altogether -- in hindsight, it's quite pointless. Also, when ignoring a constant because of this, make sure to fulfill fill_in_constant_lengths's duty of setting its length to -1. Lastly, we can use == instead of <= because the locations have been sorted beforehand, so the < case cannot arise. Co-authored-by: Sami Imseih <samimseih@gmail.com> Co-authored-by: Dmitry Dolgov <9erthalion6@gmail.com> Reported-by: Konstantin Knizhnik <knizhnik@garret.ru> Backpatch-through: 18 Discussion: https://www.postgresql.org/message-id/2b91e358-0d99-43f7-be44-d2d4dbce37b3%40garret.ru		2 months ago
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cleanup.out	…
cursors.out	…
dml.out	Remove the query_id_squash_values GUC	9 months ago
entry_timestamp.out	…
extended.out	Make query jumbling also squash PARAM_EXTERN params	6 months ago
level_tracking.out	Revert support for improved tracking of nested queries	6 months ago
oldextversions.out	pg_stat_statements: Add wal_buffers_full	10 months ago
parallel.out	pg_stat_statements: Add columns to track parallel worker activity	1 year ago
planning.out	Revert support for improved tracking of nested queries	6 months ago
privileges.out	…
select.out	Fix squashing algorithm for query texts	6 months ago
squashing.out	pg_stat_statements: Fix handling of duplicate constant locations	2 months ago
user_activity.out	…
utility.out	Revert support for improved tracking of nested queries	6 months ago
wal.out	…