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c2da1a5d63
Commit 62d712ecfd made query jumbling squash lists of Consts as a
single element, but there's no reason not to treat PARAM_EXTERN
parameters the same. For these purposes, these values are indeed
constants for any particular execution of a query.
In particular, this should make list squashing more useful for
applications using extended query protocol, which would use parameters
extensively.
A complication arises: if a query has both external parameters and
squashable lists, then the parameter number used as placeholder for the
squashed list might be inconsistent with regards to the parameter
numbers used by the query literal. To reduce the surprise factor, all
parameters are renumbered starting from 1 in that case.
Author: Sami Imseih <samimseih@gmail.com>
Author: Dmitry Dolgov <9erthalion6@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/CAA5RZ0tRXoPG2y6bMgBCWNDt0Tn=unRerbzYM=oW0syi1=C1OA@mail.gmail.com
303 lines
13 KiB
PL/PgSQL
303 lines
13 KiB
PL/PgSQL
--
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-- Const squashing functionality
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--
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CREATE EXTENSION pg_stat_statements;
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--
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-- Simple Lists
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--
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CREATE TABLE test_squash (id int, data int);
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-- single element will not be squashed
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash WHERE id IN (1);
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SELECT ARRAY[1];
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- more than 1 element in a list will be squashed
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash WHERE id IN (1, 2, 3);
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4);
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4, 5);
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SELECT ARRAY[1, 2, 3];
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SELECT ARRAY[1, 2, 3, 4];
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SELECT ARRAY[1, 2, 3, 4, 5];
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- built-in functions will be squashed
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-- the IN and ARRAY forms of this statement will have the same queryId
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT WHERE 1 IN (1, int4(1), int4(2), 2);
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SELECT WHERE 1 = ANY (ARRAY[1, int4(1), int4(2), 2]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- external parameters will be squashed
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash WHERE id IN ($1, $2, $3, $4, $5) \bind 1 2 3 4 5
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;
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SELECT * FROM test_squash WHERE id::text = ANY(ARRAY[$1, $2, $3, $4, $5]) \bind 1 2 3 4 5
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;
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- prepared statements will also be squashed
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-- the IN and ARRAY forms of this statement will have the same queryId
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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PREPARE p1(int, int, int, int, int) AS
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SELECT * FROM test_squash WHERE id IN ($1, $2, $3, $4, $5);
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EXECUTE p1(1, 2, 3, 4, 5);
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DEALLOCATE p1;
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PREPARE p1(int, int, int, int, int) AS
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SELECT * FROM test_squash WHERE id = ANY(ARRAY[$1, $2, $3, $4, $5]);
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EXECUTE p1(1, 2, 3, 4, 5);
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DEALLOCATE p1;
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- More conditions in the query
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4, 5, 6, 7, 8, 9) AND data = 2;
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) AND data = 2;
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11) AND data = 2;
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SELECT * FROM test_squash WHERE id = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9]) AND data = 2;
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SELECT * FROM test_squash WHERE id = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) AND data = 2;
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SELECT * FROM test_squash WHERE id = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]) AND data = 2;
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Multiple squashed intervals
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4, 5, 6, 7, 8, 9)
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AND data IN (1, 2, 3, 4, 5, 6, 7, 8, 9);
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
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AND data IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
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SELECT * FROM test_squash WHERE id IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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AND data IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);
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SELECT * FROM test_squash WHERE id = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9])
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AND data = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9]);
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SELECT * FROM test_squash WHERE id = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
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AND data = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
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SELECT * FROM test_squash WHERE id = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])
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AND data = ANY (ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- No constants squashing for OpExpr
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-- The IN and ARRAY forms of this statement will have the same queryId
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash WHERE id IN
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(1 + 1, 2 + 2, 3 + 3, 4 + 4, 5 + 5, 6 + 6, 7 + 7, 8 + 8, 9 + 9);
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SELECT * FROM test_squash WHERE id IN
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(@ '-1', @ '-2', @ '-3', @ '-4', @ '-5', @ '-6', @ '-7', @ '-8', @ '-9');
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SELECT * FROM test_squash WHERE id = ANY(ARRAY
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[1 + 1, 2 + 2, 3 + 3, 4 + 4, 5 + 5, 6 + 6, 7 + 7, 8 + 8, 9 + 9]);
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SELECT * FROM test_squash WHERE id = ANY(ARRAY
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[@ '-1', @ '-2', @ '-3', @ '-4', @ '-5', @ '-6', @ '-7', @ '-8', @ '-9']);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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--
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-- FuncExpr
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--
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-- Verify multiple type representation end up with the same query_id
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CREATE TABLE test_float (data float);
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-- The casted ARRAY expressions will have the same queryId as the IN clause
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-- form of the query
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT data FROM test_float WHERE data IN (1, 2);
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SELECT data FROM test_float WHERE data IN (1, '2');
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SELECT data FROM test_float WHERE data IN ('1', 2);
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SELECT data FROM test_float WHERE data IN ('1', '2');
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SELECT data FROM test_float WHERE data IN (1.0, 1.0);
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SELECT data FROM test_float WHERE data = ANY(ARRAY['1'::double precision, '2'::double precision]);
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SELECT data FROM test_float WHERE data = ANY(ARRAY[1.0::double precision, 1.0::double precision]);
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SELECT data FROM test_float WHERE data = ANY(ARRAY[1, 2]);
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SELECT data FROM test_float WHERE data = ANY(ARRAY[1, '2']);
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SELECT data FROM test_float WHERE data = ANY(ARRAY['1', 2]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Numeric type, implicit cast is squashed
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CREATE TABLE test_squash_numeric (id int, data numeric(5, 2));
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash_numeric WHERE data IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);
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SELECT * FROM test_squash_numeric WHERE data = ANY(ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Bigint, implicit cast is squashed
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CREATE TABLE test_squash_bigint (id int, data bigint);
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash_bigint WHERE data IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);
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SELECT * FROM test_squash_bigint WHERE data = ANY(ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Bigint, explicit cast is squashed
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash_bigint WHERE data IN
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(1::bigint, 2::bigint, 3::bigint, 4::bigint, 5::bigint, 6::bigint,
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7::bigint, 8::bigint, 9::bigint, 10::bigint, 11::bigint);
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SELECT * FROM test_squash_bigint WHERE data = ANY(ARRAY[
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1::bigint, 2::bigint, 3::bigint, 4::bigint, 5::bigint, 6::bigint,
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7::bigint, 8::bigint, 9::bigint, 10::bigint, 11::bigint]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Bigint, long tokens with parenthesis, will not squash
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash_bigint WHERE id IN
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(abs(100), abs(200), abs(300), abs(400), abs(500), abs(600), abs(700),
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abs(800), abs(900), abs(1000), ((abs(1100))));
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SELECT * FROM test_squash_bigint WHERE id = ANY(ARRAY[
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abs(100), abs(200), abs(300), abs(400), abs(500), abs(600), abs(700),
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abs(800), abs(900), abs(1000), ((abs(1100)))]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Multiple FuncExpr's. Will not squash
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT WHERE 1 IN (1::int::bigint::int, 2::int::bigint::int);
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SELECT WHERE 1 = ANY(ARRAY[1::int::bigint::int, 2::int::bigint::int]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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--
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-- CoerceViaIO
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--
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-- Create some dummy type to force CoerceViaIO
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CREATE TYPE casttesttype;
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CREATE FUNCTION casttesttype_in(cstring)
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RETURNS casttesttype
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AS 'textin'
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LANGUAGE internal STRICT IMMUTABLE;
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CREATE FUNCTION casttesttype_out(casttesttype)
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RETURNS cstring
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AS 'textout'
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LANGUAGE internal STRICT IMMUTABLE;
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CREATE TYPE casttesttype (
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internallength = variable,
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input = casttesttype_in,
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output = casttesttype_out,
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alignment = int4
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);
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CREATE CAST (int4 AS casttesttype) WITH INOUT;
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CREATE FUNCTION casttesttype_eq(casttesttype, casttesttype)
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returns boolean language sql immutable as $$
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SELECT true
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$$;
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CREATE OPERATOR = (
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leftarg = casttesttype,
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rightarg = casttesttype,
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procedure = casttesttype_eq,
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commutator = =);
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CREATE TABLE test_squash_cast (id int, data casttesttype);
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-- Use the introduced type to construct a list of CoerceViaIO around Const
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash_cast WHERE data IN
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(1::int4::casttesttype, 2::int4::casttesttype, 3::int4::casttesttype,
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4::int4::casttesttype, 5::int4::casttesttype, 6::int4::casttesttype,
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7::int4::casttesttype, 8::int4::casttesttype, 9::int4::casttesttype,
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10::int4::casttesttype, 11::int4::casttesttype);
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SELECT * FROM test_squash_cast WHERE data = ANY (ARRAY
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[1::int4::casttesttype, 2::int4::casttesttype, 3::int4::casttesttype,
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4::int4::casttesttype, 5::int4::casttesttype, 6::int4::casttesttype,
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7::int4::casttesttype, 8::int4::casttesttype, 9::int4::casttesttype,
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10::int4::casttesttype, 11::int4::casttesttype]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Some casting expression are simplified to Const
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CREATE TABLE test_squash_jsonb (id int, data jsonb);
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash_jsonb WHERE data IN
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(('"1"')::jsonb, ('"2"')::jsonb, ('"3"')::jsonb, ('"4"')::jsonb,
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('"5"')::jsonb, ('"6"')::jsonb, ('"7"')::jsonb, ('"8"')::jsonb,
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('"9"')::jsonb, ('"10"')::jsonb);
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SELECT * FROM test_squash_jsonb WHERE data = ANY (ARRAY
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[('"1"')::jsonb, ('"2"')::jsonb, ('"3"')::jsonb, ('"4"')::jsonb,
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('"5"')::jsonb, ('"6"')::jsonb, ('"7"')::jsonb, ('"8"')::jsonb,
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('"9"')::jsonb, ('"10"')::jsonb]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- CoerceViaIO, SubLink instead of a Const. Will not squash
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT * FROM test_squash_jsonb WHERE data IN
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((SELECT '"1"')::jsonb, (SELECT '"2"')::jsonb, (SELECT '"3"')::jsonb,
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(SELECT '"4"')::jsonb, (SELECT '"5"')::jsonb, (SELECT '"6"')::jsonb,
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(SELECT '"7"')::jsonb, (SELECT '"8"')::jsonb, (SELECT '"9"')::jsonb,
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(SELECT '"10"')::jsonb);
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SELECT * FROM test_squash_jsonb WHERE data = ANY(ARRAY
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[(SELECT '"1"')::jsonb, (SELECT '"2"')::jsonb, (SELECT '"3"')::jsonb,
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(SELECT '"4"')::jsonb, (SELECT '"5"')::jsonb, (SELECT '"6"')::jsonb,
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(SELECT '"7"')::jsonb, (SELECT '"8"')::jsonb, (SELECT '"9"')::jsonb,
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(SELECT '"10"')::jsonb]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Multiple CoerceViaIO are squashed
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT WHERE 1 IN (1::text::int::text::int, 1::text::int::text::int);
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SELECT WHERE 1 = ANY(ARRAY[1::text::int::text::int, 1::text::int::text::int]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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--
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-- RelabelType
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--
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- However many layers of RelabelType there are, the list will be squashable.
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SELECT * FROM test_squash WHERE id IN
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(1::oid, 2::oid, 3::oid, 4::oid, 5::oid, 6::oid, 7::oid, 8::oid, 9::oid);
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SELECT ARRAY[1::oid, 2::oid, 3::oid, 4::oid, 5::oid, 6::oid, 7::oid, 8::oid, 9::oid];
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SELECT * FROM test_squash WHERE id IN (1::oid, 2::oid::int::oid);
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SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::oid, 2::oid::int::oid]);
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-- RelabelType together with CoerceViaIO is also squashable
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SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::oid::text::int::oid, 2::oid::int::oid]);
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SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::text::int::oid, 2::oid::int::oid]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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--
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-- edge cases
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--
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- for nested arrays, only constants are squashed
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SELECT ARRAY[
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ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
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ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
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ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
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ARRAY[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
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];
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Test constants evaluation in a CTE, which was causing issues in the past
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WITH cte AS (
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SELECT 'const' as const FROM test_squash
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)
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SELECT ARRAY['a', 'b', 'c', const::varchar] AS result
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FROM cte;
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- Rewritten as an OpExpr, so it will not be squashed
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select where '1' IN ('1'::int, '2'::int::text);
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-- Rewritten as an ArrayExpr, so it will be squashed
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select where '1' IN ('1'::int, '2'::int);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- Both of these queries will be rewritten as an ArrayExpr, so they
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-- will be squashed, and have a similar queryId
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select where '1' IN ('1'::int::text, '2'::int::text);
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select where '1' = ANY (array['1'::int::text, '2'::int::text]);
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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--
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-- cleanup
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--
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DROP TABLE test_squash;
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DROP TABLE test_float;
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DROP TABLE test_squash_numeric;
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DROP TABLE test_squash_bigint;
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DROP TABLE test_squash_cast CASCADE;
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DROP TABLE test_squash_jsonb;
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