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Improve jumble squashing through CoerceViaIO and RelabelType

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There's no principled reason for query jumbling to only remove the first
layer of RelabelType and CoerceViaIO.  Change it to see through as many
layers as there are.
This commit is contained in:
Álvaro Herrera
2025-06-24 19:36:12 +02:00
parent 303ba0573c
commit debad29d22
3 changed files with 45 additions and 31 deletions
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9
contrib/pg_stat_statements/sql/squashing.sql
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@ -234,7 +234,7 @@ SELECT * FROM test_squash_jsonb WHERE data = ANY(ARRAY
(SELECT '"10"')::jsonb]);
SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
-- Multiple CoerceViaIO wrapping a constant. Will not squash
-- Multiple CoerceViaIO are squashed
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
SELECT WHERE 1 IN (1::text::int::text::int, 1::text::int::text::int);
SELECT WHERE 1 = ANY(ARRAY[1::text::int::text::int, 1::text::int::text::int]);
@ -245,14 +245,15 @@ SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
--
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
-- if there is only one level of RelabelType, the list will be squashable
-- However many layers of RelabelType there are, the list will be squashable.
SELECT * FROM test_squash WHERE id IN
(1::oid, 2::oid, 3::oid, 4::oid, 5::oid, 6::oid, 7::oid, 8::oid, 9::oid);
SELECT ARRAY[1::oid, 2::oid, 3::oid, 4::oid, 5::oid, 6::oid, 7::oid, 8::oid, 9::oid];
-- if there is at least one element with multiple levels of RelabelType,
-- the list will not be squashable
SELECT * FROM test_squash WHERE id IN (1::oid, 2::oid::int::oid);
SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::oid, 2::oid::int::oid]);
-- RelabelType together with CoerceViaIO is also squashable
SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::oid::text::int::oid, 2::oid::int::oid]);
SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::text::int::oid, 2::oid::int::oid]);
SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
--