diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 8754f2f89b..1b064b4feb 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -19973,7 +19973,7 @@ SELECT NULLIF(value, '(none)') ...
values. Available for any numeric, string, date/time, or enum type,
as well as inet, interval,
money, oid, pg_lsn,
- tid,
+ tid, xid8,
and arrays of any of these types.
Yes
@@ -19992,7 +19992,7 @@ SELECT NULLIF(value, '(none)') ...
values. Available for any numeric, string, date/time, or enum type,
as well as inet, interval,
money, oid, pg_lsn,
- tid,
+ tid, xid8,
and arrays of any of these types.
Yes
diff --git a/src/backend/utils/adt/xid.c b/src/backend/utils/adt/xid.c
index 9b4ceaea47..e4b4952a28 100644
--- a/src/backend/utils/adt/xid.c
+++ b/src/backend/utils/adt/xid.c
@@ -286,6 +286,30 @@ xid8cmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32(-1);
}
+Datum
+xid8_larger(PG_FUNCTION_ARGS)
+{
+ FullTransactionId fxid1 = PG_GETARG_FULLTRANSACTIONID(0);
+ FullTransactionId fxid2 = PG_GETARG_FULLTRANSACTIONID(1);
+
+ if (FullTransactionIdFollows(fxid1, fxid2))
+ PG_RETURN_FULLTRANSACTIONID(fxid1);
+ else
+ PG_RETURN_FULLTRANSACTIONID(fxid2);
+}
+
+Datum
+xid8_smaller(PG_FUNCTION_ARGS)
+{
+ FullTransactionId fxid1 = PG_GETARG_FULLTRANSACTIONID(0);
+ FullTransactionId fxid2 = PG_GETARG_FULLTRANSACTIONID(1);
+
+ if (FullTransactionIdPrecedes(fxid1, fxid2))
+ PG_RETURN_FULLTRANSACTIONID(fxid1);
+ else
+ PG_RETURN_FULLTRANSACTIONID(fxid2);
+}
+
/*****************************************************************************
* COMMAND IDENTIFIER ROUTINES *
*****************************************************************************/
diff --git a/src/include/catalog/pg_aggregate.dat b/src/include/catalog/pg_aggregate.dat
index 137f6eef69..2843f4b415 100644
--- a/src/include/catalog/pg_aggregate.dat
+++ b/src/include/catalog/pg_aggregate.dat
@@ -149,6 +149,9 @@
{ aggfnoid => 'max(pg_lsn)', aggtransfn => 'pg_lsn_larger',
aggcombinefn => 'pg_lsn_larger', aggsortop => '>(pg_lsn,pg_lsn)',
aggtranstype => 'pg_lsn' },
+{ aggfnoid => 'max(xid8)', aggtransfn => 'xid8_larger',
+ aggcombinefn => 'xid8_larger', aggsortop => '>(xid8,xid8)',
+ aggtranstype => 'xid8' },
# min
{ aggfnoid => 'min(int8)', aggtransfn => 'int8smaller',
@@ -214,6 +217,9 @@
{ aggfnoid => 'min(pg_lsn)', aggtransfn => 'pg_lsn_smaller',
aggcombinefn => 'pg_lsn_smaller', aggsortop => '<(pg_lsn,pg_lsn)',
aggtranstype => 'pg_lsn' },
+{ aggfnoid => 'min(xid8)', aggtransfn => 'xid8_smaller',
+ aggcombinefn => 'xid8_smaller', aggsortop => '<(xid8,xid8)',
+ aggtranstype => 'xid8' },
# count
{ aggfnoid => 'count(any)', aggtransfn => 'int8inc_any',
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 7024dbe10a..62f36daa98 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -203,6 +203,12 @@
{ oid => '5071', descr => 'convert xid8 to xid',
proname => 'xid', prorettype => 'xid', proargtypes => 'xid8',
prosrc => 'xid8toxid' },
+{ oid => '5097', descr => 'larger of two',
+ proname => 'xid8_larger', prorettype => 'xid8', proargtypes => 'xid8 xid8',
+ prosrc => 'xid8_larger' },
+{ oid => '5098', descr => 'smaller of two',
+ proname => 'xid8_smaller', prorettype => 'xid8', proargtypes => 'xid8 xid8',
+ prosrc => 'xid8_smaller' },
{ oid => '69',
proname => 'cideq', proleakproof => 't', prorettype => 'bool',
proargtypes => 'cid cid', prosrc => 'cideq' },
@@ -6564,6 +6570,9 @@
{ oid => '4189', descr => 'maximum value of all pg_lsn input values',
proname => 'max', prokind => 'a', proisstrict => 'f', prorettype => 'pg_lsn',
proargtypes => 'pg_lsn', prosrc => 'aggregate_dummy' },
+{ oid => '5099', descr => 'maximum value of all xid8 input values',
+ proname => 'max', prokind => 'a', proisstrict => 'f', prorettype => 'xid8',
+ proargtypes => 'xid8', prosrc => 'aggregate_dummy' },
{ oid => '2131', descr => 'minimum value of all bigint input values',
proname => 'min', prokind => 'a', proisstrict => 'f', prorettype => 'int8',
@@ -6631,6 +6640,9 @@
{ oid => '4190', descr => 'minimum value of all pg_lsn input values',
proname => 'min', prokind => 'a', proisstrict => 'f', prorettype => 'pg_lsn',
proargtypes => 'pg_lsn', prosrc => 'aggregate_dummy' },
+{ oid => '5100', descr => 'minimum value of all xid8 input values',
+ proname => 'min', prokind => 'a', proisstrict => 'f', prorettype => 'xid8',
+ proargtypes => 'xid8', prosrc => 'aggregate_dummy' },
# count has two forms: count(any) and count(*)
{ oid => '2147',
diff --git a/src/test/regress/expected/xid.out b/src/test/regress/expected/xid.out
index b7a1ed0f9e..d8e76f3321 100644
--- a/src/test/regress/expected/xid.out
+++ b/src/test/regress/expected/xid.out
@@ -129,8 +129,16 @@ select xid8cmp('1', '2'), xid8cmp('2', '2'), xid8cmp('2', '1');
-1 | 0 | 1
(1 row)
--- xid8 has btree and hash opclasses
+-- min() and max() for xid8
create table xid8_t1 (x xid8);
+insert into xid8_t1 values ('0'), ('010'), ('42'), ('0xffffffffffffffff'), ('-1');
+select min(x), max(x) from xid8_t1;
+ min | max
+-----+----------------------
+ 0 | 18446744073709551615
+(1 row)
+
+-- xid8 has btree and hash opclasses
create index on xid8_t1 using btree(x);
create index on xid8_t1 using hash(x);
drop table xid8_t1;
diff --git a/src/test/regress/sql/xid.sql b/src/test/regress/sql/xid.sql
index 565714d462..bee17e6364 100644
--- a/src/test/regress/sql/xid.sql
+++ b/src/test/regress/sql/xid.sql
@@ -41,8 +41,12 @@ select '1'::xid8 >= '2'::xid8, '2'::xid8 >= '2'::xid8, '2'::xid8 >= '1'::xid8;
-- we also have a 3way compare for btrees
select xid8cmp('1', '2'), xid8cmp('2', '2'), xid8cmp('2', '1');
--- xid8 has btree and hash opclasses
+-- min() and max() for xid8
create table xid8_t1 (x xid8);
+insert into xid8_t1 values ('0'), ('010'), ('42'), ('0xffffffffffffffff'), ('-1');
+select min(x), max(x) from xid8_t1;
+
+-- xid8 has btree and hash opclasses
create index on xid8_t1 using btree(x);
create index on xid8_t1 using hash(x);
drop table xid8_t1;