Add min and max aggregates for composite types (records).

Like min/max for arrays, these are just thin wrappers around
the existing btree comparison function for records.

Aleksander Alekseev

Discussion: https://postgr.es/m/CAO=iB8L4WYSNxCJ8GURRjQsrXEQ2-zn3FiCsh2LMqvWq2WcONg@mail.gmail.com

3 files changed, 20 insertions, 2 deletions

diff --git a/src/include/catalog/catversion.h b/src/include/catalog/catversion.h
index 87b52fffdde..3254e7ab929 100644
--- a/src/include/catalog/catversion.h
+++ b/src/include/catalog/catversion.h
@@ -57,6 +57,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	202407101
+#define CATALOG_VERSION_NO	202407111
 
 #endif
diff --git a/src/include/catalog/pg_aggregate.dat b/src/include/catalog/pg_aggregate.dat
index 5f13532abcc..b6b6352d917 100644
--- a/src/include/catalog/pg_aggregate.dat
+++ b/src/include/catalog/pg_aggregate.dat
@@ -140,6 +140,9 @@
 { aggfnoid => 'max(anyarray)', aggtransfn => 'array_larger',
   aggcombinefn => 'array_larger', aggsortop => '>(anyarray,anyarray)',
   aggtranstype => 'anyarray' },
+{ aggfnoid => 'max(record)', aggtransfn => 'record_larger',
+  aggcombinefn => 'record_larger', aggsortop => '>(record,record)',
+  aggtranstype => 'record' },
 { aggfnoid => 'max(bpchar)', aggtransfn => 'bpchar_larger',
   aggcombinefn => 'bpchar_larger', aggsortop => '>(bpchar,bpchar)',
   aggtranstype => 'bpchar' },
@@ -208,6 +211,9 @@
 { aggfnoid => 'min(anyarray)', aggtransfn => 'array_smaller',
   aggcombinefn => 'array_smaller', aggsortop => '<(anyarray,anyarray)',
   aggtranstype => 'anyarray' },
+{ aggfnoid => 'min(record)', aggtransfn => 'record_smaller',
+  aggcombinefn => 'record_smaller', aggsortop => '<(record,record)',
+  aggtranstype => 'record' },
 { aggfnoid => 'min(bpchar)', aggtransfn => 'bpchar_smaller',
   aggcombinefn => 'bpchar_smaller', aggsortop => '<(bpchar,bpchar)',
   aggtranstype => 'bpchar' },
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 0d140003e74..73d9cf85826 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -6754,6 +6754,9 @@
   proname => 'max', prokind => 'a', proisstrict => 'f',
   prorettype => 'anyarray', proargtypes => 'anyarray',
   prosrc => 'aggregate_dummy' },
+{ oid => '8595', descr => 'maximum value of all record input values',
+  proname => 'max', prokind => 'a', proisstrict => 'f', prorettype => 'record',
+  proargtypes => 'record', prosrc => 'aggregate_dummy' },
 { oid => '2244', descr => 'maximum value of all bpchar input values',
   proname => 'max', prokind => 'a', proisstrict => 'f', prorettype => 'bpchar',
   proargtypes => 'bpchar', prosrc => 'aggregate_dummy' },
@@ -6824,6 +6827,9 @@
   proname => 'min', prokind => 'a', proisstrict => 'f',
   prorettype => 'anyarray', proargtypes => 'anyarray',
   prosrc => 'aggregate_dummy' },
+{ oid => '8596', descr => 'minimum value of all record input values',
+  proname => 'min', prokind => 'a', proisstrict => 'f', prorettype => 'record',
+  proargtypes => 'record', prosrc => 'aggregate_dummy' },
 { oid => '2245', descr => 'minimum value of all bpchar input values',
   proname => 'min', prokind => 'a', proisstrict => 'f', prorettype => 'bpchar',
   proargtypes => 'bpchar', prosrc => 'aggregate_dummy' },
@@ -8343,7 +8349,7 @@
   prosrc => 'generate_series_timestamptz' },
 { oid => '6274', descr => 'non-persistent series generator',
   proname => 'generate_series', prorows => '1000',
-  prosupport => 'generate_series_timestamp_support',  proretset => 't',
+  prosupport => 'generate_series_timestamp_support', proretset => 't',
   prorettype => 'timestamptz',
   proargtypes => 'timestamptz timestamptz interval text',
   prosrc => 'generate_series_timestamptz_at_zone' },
@@ -10358,6 +10364,12 @@
 { oid => '2987', descr => 'less-equal-greater',
   proname => 'btrecordcmp', prorettype => 'int4',
   proargtypes => 'record record', prosrc => 'btrecordcmp' },
+{ oid => '8597', descr => 'larger of two',
+  proname => 'record_larger', prorettype => 'record',
+  proargtypes => 'record record', prosrc => 'record_larger' },
+{ oid => '8598', descr => 'smaller of two',
+  proname => 'record_smaller', prorettype => 'record',
+  proargtypes => 'record record', prosrc => 'record_smaller' },
 
 { oid => '6192', descr => 'hash',
   proname => 'hash_record', prorettype => 'int4', proargtypes => 'record',