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Álvaro Herrera 62d712ecfd Introduce squashing of constant lists in query jumbling ... pg_stat_statements produces multiple entries for queries like SELECT something FROM table WHERE col IN (1, 2, 3, ...) depending on the number of parameters, because every element of ArrayExpr is individually jumbled. Most of the time that's undesirable, especially if the list becomes too large. Fix this by introducing a new GUC query_id_squash_values which modifies the node jumbling code to only consider the first and last element of a list of constants, rather than each list element individually. This affects both the query_id generated by query jumbling, as well as pg_stat_statements query normalization so that it suppresses printing of the individual elements of such a list. The default value is off, meaning the previous behavior is maintained. Author: Dmitry Dolgov <9erthalion6@gmail.com> Reviewed-by: Sergey Dudoladov (mysterious, off-list) Reviewed-by: David Geier <geidav.pg@gmail.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Sami Imseih <samimseih@gmail.com> Reviewed-by: Sutou Kouhei <kou@clear-code.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Marcos Pegoraro <marcos@f10.com.br> Reviewed-by: Julien Rouhaud <rjuju123@gmail.com> Reviewed-by: Zhihong Yu <zyu@yugabyte.com> Tested-by: Yasuo Honda <yasuo.honda@gmail.com> Tested-by: Sergei Kornilov <sk@zsrv.org> Tested-by: Maciek Sakrejda <m.sakrejda@gmail.com> Tested-by: Chengxi Sun <sunchengxi@highgo.com> Tested-by: Jakub Wartak <jakub.wartak@enterprisedb.com> Discussion: https://postgr.es/m/CA+q6zcWtUbT_Sxj0V6HY6EZ89uv5wuG5aefpe_9n0Jr3VwntFg@mail.gmail.com		6 months ago
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cleanup.sql	…
cursors.sql	…
dml.sql	…
entry_timestamp.sql	…
extended.sql	Add missing query ID reporting in extended query protocol	1 year ago
level_tracking.sql	Fix further fallout from EXPLAIN ANALYZE BUFFERS change	9 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
squashing.sql	Introduce squashing of constant lists in query jumbling	6 months ago
user_activity.sql	…
utility.sql	pg_stat_statements: Expand tests for SET statements	12 months ago
wal.sql	…