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authorÁlvaro Herrera2025-06-24 17:36:12 +0000
committerÁlvaro Herrera2025-06-24 17:36:12 +0000
commitdebad29d22152d7fe4c4e671090e20238647c460 (patch)
treef420a350cfd116a4ea6faf9791d20c8ad21e4e6d
parent303ba0573ce656b98620133cd17418dcd217318f (diff)
Improve jumble squashing through CoerceViaIO and RelabelType
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.
-rw-r--r--contrib/pg_stat_statements/expected/squashing.out40
-rw-r--r--contrib/pg_stat_statements/sql/squashing.sql9
-rw-r--r--src/backend/nodes/queryjumblefuncs.c27
3 files changed, 45 insertions, 31 deletions
diff --git a/contrib/pg_stat_statements/expected/squashing.out b/contrib/pg_stat_statements/expected/squashing.out
index 7b935d464ec..e978564ad72 100644
--- a/contrib/pg_stat_statements/expected/squashing.out
+++ b/contrib/pg_stat_statements/expected/squashing.out
@@ -645,7 +645,7 @@ SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
SELECT pg_stat_statements_reset() IS NOT NULL AS t | 1
(2 rows)
--- Multiple CoerceViaIO wrapping a constant. Will not squash
+-- Multiple CoerceViaIO are squashed
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
t
---
@@ -661,10 +661,10 @@ SELECT WHERE 1 = ANY(ARRAY[1::text::int::text::int, 1::text::int::text::int]);
(1 row)
SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
- query | calls
--------------------------------------------------------------------------+-------
- SELECT WHERE $1 IN ($2::text::int::text::int, $3::text::int::text::int) | 2
- SELECT pg_stat_statements_reset() IS NOT NULL AS t | 1
+ query | calls
+----------------------------------------------------+-------
+ SELECT WHERE $1 IN ($2 /*, ... */) | 2
+ SELECT pg_stat_statements_reset() IS NOT NULL AS t | 1
(2 rows)
--
@@ -676,7 +676,7 @@ SELECT pg_stat_statements_reset() IS NOT NULL AS t;
t
(1 row)
--- 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);
id | data
@@ -689,8 +689,6 @@ SELECT ARRAY[1::oid, 2::oid, 3::oid, 4::oid, 5::oid, 6::oid, 7::oid, 8::oid, 9::
{1,2,3,4,5,6,7,8,9}
(1 row)
--- 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);
id | data
----+------
@@ -701,15 +699,25 @@ SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::oid, 2::oid::int::oid]);
----+------
(0 rows)
+-- RelabelType together with CoerceViaIO is also squashable
+SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::oid::text::int::oid, 2::oid::int::oid]);
+ id | data
+----+------
+(0 rows)
+
+SELECT * FROM test_squash WHERE id = ANY(ARRAY[1::text::int::oid, 2::oid::int::oid]);
+ id | data
+----+------
+(0 rows)
+
SELECT query, calls FROM pg_stat_statements ORDER BY query COLLATE "C";
- query | calls
---------------------------------------------------------------------+-------
- SELECT * FROM test_squash WHERE id IN +| 1
- ($1 /*, ... */) |
- SELECT * FROM test_squash WHERE id IN ($1::oid, $2::oid::int::oid) | 2
- SELECT ARRAY[$1 /*, ... */] | 1
- SELECT pg_stat_statements_reset() IS NOT NULL AS t | 1
-(4 rows)
+ query | calls
+----------------------------------------------------+-------
+ SELECT * FROM test_squash WHERE id IN +| 5
+ ($1 /*, ... */) |
+ SELECT ARRAY[$1 /*, ... */] | 1
+ SELECT pg_stat_statements_reset() IS NOT NULL AS t | 1
+(3 rows)
--
-- edge cases
diff --git a/contrib/pg_stat_statements/sql/squashing.sql b/contrib/pg_stat_statements/sql/squashing.sql
index bd3243ec9cd..946e149831c 100644
--- a/contrib/pg_stat_statements/sql/squashing.sql
+++ b/contrib/pg_stat_statements/sql/squashing.sql
@@ -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";
--
diff --git a/src/backend/nodes/queryjumblefuncs.c b/src/backend/nodes/queryjumblefuncs.c
index fb33e6931ad..62e3a677cd1 100644
--- a/src/backend/nodes/queryjumblefuncs.c
+++ b/src/backend/nodes/queryjumblefuncs.c
@@ -414,7 +414,7 @@ RecordConstLocation(JumbleState *jstate, int location, int len)
* Subroutine for _jumbleElements: Verify a few simple cases where we can
* deduce that the expression is a constant:
*
- * - Ignore a possible wrapping RelabelType and CoerceViaIO.
+ * - See through any wrapping RelabelType and CoerceViaIO layers.
* - If it's a FuncExpr, check that the function is a builtin
* cast and its arguments are Const.
* - Otherwise test if the expression is a simple Const.
@@ -422,14 +422,22 @@ RecordConstLocation(JumbleState *jstate, int location, int len)
static bool
IsSquashableConstant(Node *element)
{
- if (IsA(element, RelabelType))
- element = (Node *) ((RelabelType *) element)->arg;
-
- if (IsA(element, CoerceViaIO))
- element = (Node *) ((CoerceViaIO *) element)->arg;
-
+restart:
switch (nodeTag(element))
{
+ case T_RelabelType:
+ /* Unwrap RelabelType */
+ element = (Node *) ((RelabelType *) element)->arg;
+ goto restart;
+
+ case T_CoerceViaIO:
+ /* Unwrap CoerceViaIO */
+ element = (Node *) ((CoerceViaIO *) element)->arg;
+ goto restart;
+
+ case T_Const:
+ return true;
+
case T_FuncExpr:
{
FuncExpr *func = (FuncExpr *) element;
@@ -468,11 +476,8 @@ IsSquashableConstant(Node *element)
}
default:
- if (!IsA(element, Const))
- return false;
+ return false;
}
-
- return true;
}
/*