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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
47 lines
2.1 KiB
SQL
47 lines
2.1 KiB
SQL
-- Tests with extended query protocol
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SET pg_stat_statements.track_utility = FALSE;
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-- This test checks that an execute message sets a query ID.
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SELECT query_id IS NOT NULL AS query_id_set
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FROM pg_stat_activity WHERE pid = pg_backend_pid() \bind \g
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT $1 \parse stmt1
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SELECT $1, $2 \parse stmt2
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SELECT $1, $2, $3 \parse stmt3
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SELECT $1 \bind 'unnamed_val1' \g
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\bind_named stmt1 'stmt1_val1' \g
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\bind_named stmt2 'stmt2_val1' 'stmt2_val2' \g
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\bind_named stmt3 'stmt3_val1' 'stmt3_val2' 'stmt3_val3' \g
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\bind_named stmt3 'stmt3_val4' 'stmt3_val5' 'stmt3_val6' \g
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\bind_named stmt2 'stmt2_val3' 'stmt2_val4' \g
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\bind_named stmt1 'stmt1_val1' \g
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Various parameter numbering patterns
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-- Unique query IDs with parameter numbers switched.
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT WHERE ($1::int, 7) IN ((8, $2::int), ($3::int, 9)) \bind '1' '2' '3' \g
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SELECT WHERE ($2::int, 10) IN ((11, $3::int), ($1::int, 12)) \bind '1' '2' '3' \g
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SELECT WHERE $1::int IN ($2::int, $3::int) \bind '1' '2' '3' \g
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SELECT WHERE $2::int IN ($3::int, $1::int) \bind '1' '2' '3' \g
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SELECT WHERE $3::int IN ($1::int, $2::int) \bind '1' '2' '3' \g
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- Two groups of two queries with the same query ID.
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT WHERE '1'::int IN ($1::int, '2'::int) \bind '1' \g
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SELECT WHERE '4'::int IN ($1::int, '5'::int) \bind '2' \g
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SELECT WHERE $2::int IN ($1::int, '1'::int) \bind '1' '2' \g
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SELECT WHERE $2::int IN ($1::int, '2'::int) \bind '3' '4' \g
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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 squashable list, the parameters id's are kept as-is
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SELECT WHERE $3 = $1 AND $2 = $4 \bind 1 2 1 2 \g
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-- squashable list, so the parameter IDs will be re-assigned
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SELECT WHERE 1 IN (1, 2, 3) AND $3 = $1 AND $2 = $4 \bind 1 2 1 2 \g
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SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
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