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Implement ANY_VALUE aggregate
author Peter Eisentraut <peter@eisentraut.org>
2023年2月22日 08:32:12 +0000 (09:32 +0100)
committer Peter Eisentraut <peter@eisentraut.org>
2023年2月22日 08:33:07 +0000 (09:33 +0100)
SQL:2023 defines an ANY_VALUE aggregate whose purpose is to emit an
implementation-dependent (i.e. non-deterministic) value from the
aggregated rows.

Author: Vik Fearing <vik@postgresfriends.org>
Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/5cff866c-10a8-d2df-32cb-e9072e6b04a2@postgresfriends.org

doc/src/sgml/func.sgml patch | blob | blame | history
src/backend/catalog/sql_features.txt patch | blob | blame | history
src/backend/utils/adt/misc.c patch | blob | blame | history
src/include/catalog/catversion.h patch | blob | blame | history
src/include/catalog/pg_aggregate.dat patch | blob | blame | history
src/include/catalog/pg_proc.dat patch | blob | blame | history
src/test/regress/expected/aggregates.out patch | blob | blame | history
src/test/regress/sql/aggregates.sql patch | blob | blame | history

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index e09e289a438d855e898088d31110cc7424f4311a..0cbdf636327ccfd3f29897fb8f4ebd4d3d4594a4 100644 (file)
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -19735,6 +19735,20 @@ SELECT NULLIF(value, '(none)') ...
</thead>
<tbody>
+ <row>
+ <entry role="func_table_entry"><para role="func_signature">
+ <indexterm>
+ <primary>any_value</primary>
+ </indexterm>
+ <function>any_value</function> ( <type>anyelement</type> )
+ <returnvalue><replaceable>same as input type</replaceable></returnvalue>
+ </para>
+ <para>
+ Returns an arbitrary value from the non-null input values.
+ </para></entry>
+ <entry>Yes</entry>
+ </row>
+
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
diff --git a/src/backend/catalog/sql_features.txt b/src/backend/catalog/sql_features.txt
index 3766762ae361afa32874382e633f5a55b72b5ce8..75a09f14e089599f7f71c56cb376e3d8e3d721fb 100644 (file)
--- a/src/backend/catalog/sql_features.txt
+++ b/src/backend/catalog/sql_features.txt
@@ -520,6 +520,7 @@ T622 Trigonometric functions YES
T623 General logarithm functions YES
T624 Common logarithm functions YES
T625 LISTAGG NO
+T626 ANY_VALUE YES SQL:202x draft
T631 IN predicate with one list element YES
T641 Multiple column assignment NO only some syntax variants supported
T651 SQL-schema statements in SQL routines YES
diff --git a/src/backend/utils/adt/misc.c b/src/backend/utils/adt/misc.c
index 220ddb8c01111c5458188f491a8c08e08a5b80b0..f95256efd3d51d77d1381047e93d87dd3df74ec2 100644 (file)
--- a/src/backend/utils/adt/misc.c
+++ b/src/backend/utils/adt/misc.c
@@ -1041,3 +1041,12 @@ pg_get_replica_identity_index(PG_FUNCTION_ARGS)
else
PG_RETURN_NULL();
}
+
+/*
+ * Transition function for the ANY_VALUE aggregate
+ */
+Datum
+any_value_transfn(PG_FUNCTION_ARGS)
+{
+ PG_RETURN_DATUM(PG_GETARG_DATUM(0));
+}
diff --git a/src/include/catalog/catversion.h b/src/include/catalog/catversion.h
index 9c298cb125301ed5c88d5e2b15a3f125a9b26def..23a446fb11d432950ca741beab0f3ea73d6edaf8 100644 (file)
--- a/src/include/catalog/catversion.h
+++ b/src/include/catalog/catversion.h
@@ -57,6 +57,6 @@
*/
/* yyyymmddN */
-#define CATALOG_VERSION_NO 202302111
+#define CATALOG_VERSION_NO 202302221
#endif
diff --git a/src/include/catalog/pg_aggregate.dat b/src/include/catalog/pg_aggregate.dat
index 4fea7d8dc19b39af5055510d5e25a26ec54d088a..d7895cd676b736cc231cdb97df43126b3c4c3f26 100644 (file)
--- a/src/include/catalog/pg_aggregate.dat
+++ b/src/include/catalog/pg_aggregate.dat
@@ -634,4 +634,8 @@
aggfinalfn => 'dense_rank_final', aggfinalextra => 't', aggfinalmodify => 'w',
aggmfinalmodify => 'w', aggtranstype => 'internal' },
+# any_value
+{ aggfnoid => 'any_value(anyelement)', aggtransfn => 'any_value_transfn',
+ aggcombinefn => 'any_value_transfn', aggtranstype => 'anyelement' },
+
]
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 66b73c3900dc52a1130cfd6dea89d038da0c4fb0..e2a7642a2ba1ab47d3094e3c2123553960411b49 100644 (file)
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -11927,4 +11927,12 @@
prorettype => 'bytea', proargtypes => 'pg_brin_minmax_multi_summary',
prosrc => 'brin_minmax_multi_summary_send' },
+{ oid => '8981', descr => 'arbitrary value from among input values',
+ proname => 'any_value', prokind => 'a', proisstrict => 'f',
+ prorettype => 'anyelement', proargtypes => 'anyelement',
+ prosrc => 'aggregate_dummy' },
+{ oid => '8982', descr => 'aggregate transition function',
+ proname => 'any_value_transfn', prorettype => 'anyelement',
+ proargtypes => 'anyelement anyelement', prosrc => 'any_value_transfn' },
+
]
diff --git a/src/test/regress/expected/aggregates.out b/src/test/regress/expected/aggregates.out
index 52046c33dc8d479a880840a5735fe6b838ab26f5..e074cb71bf6b2251fc633af9d4d437f79c070981 100644 (file)
--- a/src/test/regress/expected/aggregates.out
+++ b/src/test/regress/expected/aggregates.out
@@ -25,6 +25,30 @@ SELECT avg(a) AS avg_32 FROM aggtest WHERE a < 100;
32.6666666666666667
(1 row)
+SELECT any_value(v) FROM (VALUES (1), (2), (3)) AS v (v);
+ any_value
+-----------
+ 1
+(1 row)
+
+SELECT any_value(v) FROM (VALUES (NULL)) AS v (v);
+ any_value
+-----------
+
+(1 row)
+
+SELECT any_value(v) FROM (VALUES (NULL), (1), (2)) AS v (v);
+ any_value
+-----------
+ 1
+(1 row)
+
+SELECT any_value(v) FROM (VALUES (array['hello', 'world'])) AS v (v);
+ any_value
+---------------
+ {hello,world}
+(1 row)
+
-- In 7.1, avg(float4) is computed using float8 arithmetic.
-- Round the result to 3 digits to avoid platform-specific results.
SELECT avg(b)::numeric(10,3) AS avg_107_943 FROM aggtest;
@@ -2033,6 +2057,12 @@ from (values ('a', 'b')) AS v(foo,bar);
a
(1 row)
+select any_value(v) filter (where v > 2) from (values (1), (2), (3)) as v (v);
+ any_value
+-----------
+ 3
+(1 row)
+
-- outer reference in FILTER (PostgreSQL extension)
select (select count(*)
from (values (1)) t0(inner_c))
diff --git a/src/test/regress/sql/aggregates.sql b/src/test/regress/sql/aggregates.sql
index e7970983c3677d45c6feeb238864876cdf9358fb..616ef38c25952b9c7a0a2c27f835c8a42f61b7dd 100644 (file)
--- a/src/test/regress/sql/aggregates.sql
+++ b/src/test/regress/sql/aggregates.sql
@@ -24,6 +24,11 @@ SELECT avg(four) AS avg_1 FROM onek;
SELECT avg(a) AS avg_32 FROM aggtest WHERE a < 100;
+SELECT any_value(v) FROM (VALUES (1), (2), (3)) AS v (v);
+SELECT any_value(v) FROM (VALUES (NULL)) AS v (v);
+SELECT any_value(v) FROM (VALUES (NULL), (1), (2)) AS v (v);
+SELECT any_value(v) FROM (VALUES (array['hello', 'world'])) AS v (v);
+
-- In 7.1, avg(float4) is computed using float8 arithmetic.
-- Round the result to 3 digits to avoid platform-specific results.
@@ -810,6 +815,8 @@ having exists (select 1 from onek b where sum(distinct a.four) = b.four);
select max(foo COLLATE "C") filter (where (bar collate "POSIX") > '0')
from (values ('a', 'b')) AS v(foo,bar);
+select any_value(v) filter (where v > 2) from (values (1), (2), (3)) as v (v);
+
-- outer reference in FILTER (PostgreSQL extension)
select (select count(*)
from (values (1)) t0(inner_c))
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