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[PATCH v2 5/6] Handle pg_get_expr default args in system_functions.sql

Mark Wong <markwkm@gmail.com> — 2025-12-09T19:17:56Z

Modernize pg_get_expr to use CREATE OR REPLACE FUNCTION to handle the
optional pretty argument.
---
 src/backend/catalog/system_functions.sql |  7 +++++++
 src/backend/commands/tablecmds.c         |  4 ++--
 src/backend/utils/adt/ruleutils.c        | 17 -----------------
 src/include/catalog/pg_proc.dat          |  5 +----
 4 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/src/backend/catalog/system_functions.sql b/src/backend/catalog/system_functions.sql
index 1824faab231..a6f7cdf3a36 100644
--- a/src/backend/catalog/system_functions.sql
+++ b/src/backend/catalog/system_functions.sql
@@ -692,6 +692,13 @@ LANGUAGE INTERNAL
 PARALLEL SAFE
 AS 'pg_get_constraintdef';
 
+CREATE OR REPLACE FUNCTION
+  pg_get_expr(expr pg_node_tree, relation oid, pretty bool DEFAULT false)
+RETURNS TEXT
+LANGUAGE INTERNAL
+PARALLEL SAFE
+AS 'pg_get_expr';
+
 --
 -- The default permissions for functions mean that anyone can execute them.
 -- A number of functions shouldn't be executable by just anyone, but rather
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f976c0e5c7e..12c4ce08437 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -17480,8 +17480,8 @@ decompile_conbin(HeapTuple contup, TupleDesc tupdesc)
 	if (isnull)
 		elog(ERROR, "null conbin for constraint %u", con->oid);
 
-	expr = DirectFunctionCall2(pg_get_expr, attr,
-							   ObjectIdGetDatum(con->conrelid));
+	expr = DirectFunctionCall3(pg_get_expr, attr,
+							   ObjectIdGetDatum(con->conrelid), false);
 	return TextDatumGetCString(expr);
 }
 
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 9faf340f0c6..305e3e80c41 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -2573,23 +2573,6 @@ decompile_column_index_array(Datum column_index_array, Oid relId,
  */
 Datum
 pg_get_expr(PG_FUNCTION_ARGS)
-{
-	text	   *expr = PG_GETARG_TEXT_PP(0);
-	Oid			relid = PG_GETARG_OID(1);
-	text	   *result;
-	int			prettyFlags;
-
-	prettyFlags = PRETTYFLAG_INDENT;
-
-	result = pg_get_expr_worker(expr, relid, prettyFlags);
-	if (result)
-		PG_RETURN_TEXT_P(result);
-	else
-		PG_RETURN_NULL();
-}
-
-Datum
-pg_get_expr_ext(PG_FUNCTION_ARGS)
 {
 	text	   *expr = PG_GETARG_TEXT_PP(0);
 	Oid			relid = PG_GETARG_OID(1);
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 96eb7baf8e0..3a0be2d4b2a 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -3986,9 +3986,6 @@
 { oid => '1662', descr => 'trigger description',
   proname => 'pg_get_triggerdef', provolatile => 's', prorettype => 'text',
   proargtypes => 'oid', prosrc => 'pg_get_triggerdef' },
-{ oid => '1716', descr => 'deparse an encoded expression',
-  proname => 'pg_get_expr', provolatile => 's', prorettype => 'text',
-  proargtypes => 'pg_node_tree oid', prosrc => 'pg_get_expr' },
 { oid => '1665', descr => 'name of sequence for a serial column',
   proname => 'pg_get_serial_sequence', provolatile => 's', prorettype => 'text',
   proargtypes => 'text text', prosrc => 'pg_get_serial_sequence' },
@@ -8518,7 +8515,7 @@
 { oid => '2509',
   descr => 'deparse an encoded expression with pretty-print option',
   proname => 'pg_get_expr', provolatile => 's', prorettype => 'text',
-  proargtypes => 'pg_node_tree oid bool', prosrc => 'pg_get_expr_ext' },
+  proargtypes => 'pg_node_tree oid bool', prosrc => 'pg_get_expr' },
 { oid => '2510', descr => 'get the prepared statements for this session',
   proname => 'pg_prepared_statement', prorows => '1000', proretset => 't',
   provolatile => 's', proparallel => 'r', prorettype => 'record',
-- 
2.43.0


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