Fix ALTER OPERATOR to update dependencies properly.

Fix an oversight in commit 321eed5f: replacing an operator's
selectivity functions needs to result in a corresponding update in
pg_depend.  We have a function that can handle that, but it was not
called by AlterOperator().

To fix this without enlarging pg_operator.h's #include list beyond
what clients can safely include, split off the function definitions
into a new file pg_operator_fn.h, similarly to what we've done for
some other catalog header files.  It's not entirely clear whether
any client-side code needs to include pg_operator.h, but it seems
prudent to assume that there is some such code somewhere.

src/backend/catalog/pg_operator.c

@@ -26,6 +26,7 @@
 #include "catalog/objectaccess.h"
 #include "catalog/pg_namespace.h"
 #include "catalog/pg_operator.h"
+#include "catalog/pg_operator_fn.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_type.h"
 #include "miscadmin.h"
@@ -61,8 +62,6 @@ static Oid get_other_operator(List *otherOp,
 				   Oid leftTypeId, Oid rightTypeId,
 				   bool isCommutator);
 
-static ObjectAddress makeOperatorDependencies(HeapTuple tuple);
-
 
 /*
  * Check whether a proposed operator name is legal
@@ -270,7 +269,7 @@ OperatorShellMake(const char *operatorName,
 	CatalogUpdateIndexes(pg_operator_desc, tup);
 
 	/* Add dependencies for the entry */
-	makeOperatorDependencies(tup);
+	makeOperatorDependencies(tup, false);
 
 	heap_freetuple(tup);
 
@@ -340,6 +339,7 @@ OperatorCreate(const char *operatorName,
 {
 	Relation	pg_operator_desc;
 	HeapTuple	tup;
+	bool		isUpdate;
 	bool		nulls[Natts_pg_operator];
 	bool		replaces[Natts_pg_operator];
 	Datum		values[Natts_pg_operator];
@@ -350,7 +350,6 @@ OperatorCreate(const char *operatorName,
 				negatorId;
 	bool		selfCommutator = false;
 	NameData	oname;
-	TupleDesc	tupDesc;
 	int			i;
 	ObjectAddress address;
 
@@ -515,6 +514,8 @@ OperatorCreate(const char *operatorName,
 	 */
 	if (operatorObjectId)
 	{
+		isUpdate = true;
+
 		tup = SearchSysCacheCopy1(OPEROID,
 								  ObjectIdGetDatum(operatorObjectId));
 		if (!HeapTupleIsValid(tup))
@@ -531,8 +532,10 @@ OperatorCreate(const char *operatorName,
 	}
 	else
 	{
-		tupDesc = pg_operator_desc->rd_att;
-		tup = heap_form_tuple(tupDesc, values, nulls);
+		isUpdate = false;
+
+		tup = heap_form_tuple(RelationGetDescr(pg_operator_desc),
+							  values, nulls);
 
 		operatorObjectId = simple_heap_insert(pg_operator_desc, tup);
 	}
@@ -541,7 +544,7 @@ OperatorCreate(const char *operatorName,
 	CatalogUpdateIndexes(pg_operator_desc, tup);
 
 	/* Add dependencies for the entry */
-	address = makeOperatorDependencies(tup);
+	address = makeOperatorDependencies(tup, isUpdate);
 
 	/* Post creation hook for new operator */
 	InvokeObjectPostCreateHook(OperatorRelationId, operatorObjectId, 0);
@@ -759,14 +762,15 @@ OperatorUpd(Oid baseId, Oid commId, Oid negId)
 }
 
 /*
- * Create dependencies for a new operator (either a freshly inserted
- * complete operator, a new shell operator, or a just-updated shell).
+ * Create dependencies for an operator (either a freshly inserted
+ * complete operator, a new shell operator, a just-updated shell,
+ * or an operator that's being modified by ALTER OPERATOR).
  *
  * NB: the OidIsValid tests in this routine are necessary, in case
  * the given operator is a shell.
  */
-static ObjectAddress
-makeOperatorDependencies(HeapTuple tuple)
+ObjectAddress
+makeOperatorDependencies(HeapTuple tuple, bool isUpdate)
 {
 	Form_pg_operator oper = (Form_pg_operator) GETSTRUCT(tuple);
 	ObjectAddress myself,
@@ -777,11 +781,14 @@ makeOperatorDependencies(HeapTuple tuple)
 	myself.objectSubId = 0;
 
 	/*
-	 * In case we are updating a shell, delete any existing entries, except
+	 * If we are updating the operator, delete any existing entries, except
 	 * for extension membership which should remain the same.
 	 */
+	if (isUpdate)
+	{
 		deleteDependencyRecordsFor(myself.classId, myself.objectId, true);
 		deleteSharedDependencyRecordsFor(myself.classId, myself.objectId, 0);
+	}
 
 	/* Dependency on namespace */
 	if (OidIsValid(oper->oprnamespace))

src/backend/commands/operatorcmds.c

@@ -40,6 +40,7 @@
 #include "catalog/indexing.h"
 #include "catalog/objectaccess.h"
 #include "catalog/pg_operator.h"
+#include "catalog/pg_operator_fn.h"
 #include "catalog/pg_type.h"
 #include "commands/alter.h"
 #include "commands/defrem.h"
@@ -500,9 +501,9 @@ AlterOperator(AlterOperatorStmt *stmt)
 	simple_heap_update(catalog, &tup->t_self, tup);
 	CatalogUpdateIndexes(catalog, tup);
 
-	InvokeObjectPostAlterHook(OperatorRelationId, oprId, 0);
+	address = makeOperatorDependencies(tup, true);
 
-	ObjectAddressSet(address, OperatorRelationId, oprId);
+	InvokeObjectPostAlterHook(OperatorRelationId, oprId, 0);
 
 	heap_close(catalog, NoLock);
 

src/include/catalog/pg_operator.h

@@ -23,8 +23,6 @@
 #define PG_OPERATOR_H
 
 #include "catalog/genbki.h"
-#include "catalog/objectaddress.h"
-#include "nodes/pg_list.h"
 
 /* ----------------
  *		pg_operator definition.  cpp turns this into
@@ -1826,19 +1824,4 @@ DESCR("delete array element");
 DATA(insert OID = 3287 (  "#-"	   PGNSP PGUID b f f 3802 1009 3802 0 0 jsonb_delete_path - - ));
 DESCR("delete path");
 
-/*
- * function prototypes
- */
-extern ObjectAddress OperatorCreate(const char *operatorName,
-			   Oid operatorNamespace,
-			   Oid leftTypeId,
-			   Oid rightTypeId,
-			   Oid procedureId,
-			   List *commutatorName,
-			   List *negatorName,
-			   Oid restrictionId,
-			   Oid joinId,
-			   bool canMerge,
-			   bool canHash);
-
 #endif   /* PG_OPERATOR_H */

src/include/catalog/pg_operator_fn.h

+/*-------------------------------------------------------------------------
+ *
+ * pg_operator_fn.h
+*	 prototypes for functions in catalog/pg_operator.c
+ *
+ *
+ * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/catalog/pg_operator_fn.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_OPERATOR_FN_H
+#define PG_OPERATOR_FN_H
+
+#include "catalog/objectaddress.h"
+#include "nodes/pg_list.h"
+
+extern ObjectAddress OperatorCreate(const char *operatorName,
+			   Oid operatorNamespace,
+			   Oid leftTypeId,
+			   Oid rightTypeId,
+			   Oid procedureId,
+			   List *commutatorName,
+			   List *negatorName,
+			   Oid restrictionId,
+			   Oid joinId,
+			   bool canMerge,
+			   bool canHash);
+
+extern ObjectAddress makeOperatorDependencies(HeapTuple tuple, bool isUpdate);
+
+#endif   /* PG_OPERATOR_FN_H */

src/test/regress/expected/alter_operator.out

-CREATE OR REPLACE FUNCTION alter_op_test_fn(boolean, boolean)
+CREATE FUNCTION alter_op_test_fn(boolean, boolean)
 RETURNS boolean AS $$ SELECT NULL::BOOLEAN; $$ LANGUAGE sql IMMUTABLE;
+CREATE FUNCTION customcontsel(internal, oid, internal, integer)
+RETURNS float8 AS 'contsel' LANGUAGE internal STABLE STRICT;
 CREATE OPERATOR === (
     LEFTARG = boolean,
     RIGHTARG = boolean,
     PROCEDURE = alter_op_test_fn,
     COMMUTATOR = ===,
     NEGATOR = !==,
-    RESTRICT = contsel,
+    RESTRICT = customcontsel,
     JOIN = contjoinsel,
     HASHES, MERGES
 );
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+                          ref                          | deptype 
+-------------------------------------------------------+---------
+ function alter_op_test_fn(boolean,boolean)            | n
+ function customcontsel(internal,oid,internal,integer) | n
+ schema public                                         | n
+(3 rows)
+
 --
 -- Reset and set params
 --
@@ -22,6 +36,17 @@ SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
  -       | -
 (1 row)
 
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+                    ref                     | deptype 
+--------------------------------------------+---------
+ function alter_op_test_fn(boolean,boolean) | n
+ schema public                              | n
+(2 rows)
+
 ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = contsel);
 ALTER OPERATOR === (boolean, boolean) SET (JOIN = contjoinsel);
 SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
@@ -31,6 +56,17 @@ SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
  contsel | contjoinsel
 (1 row)
 
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+                    ref                     | deptype 
+--------------------------------------------+---------
+ function alter_op_test_fn(boolean,boolean) | n
+ schema public                              | n
+(2 rows)
+
 ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = NONE, JOIN = NONE);
 SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
   AND oprleft = 'boolean'::regtype AND oprright = 'boolean'::regtype;
@@ -39,14 +75,37 @@ SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
  -       | -
 (1 row)
 
-ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = contsel, JOIN = contjoinsel);
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+                    ref                     | deptype 
+--------------------------------------------+---------
+ function alter_op_test_fn(boolean,boolean) | n
+ schema public                              | n
+(2 rows)
+
+ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = customcontsel, JOIN = contjoinsel);
 SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
   AND oprleft = 'boolean'::regtype AND oprright = 'boolean'::regtype;
     oprrest    |   oprjoin   
----------+-------------
- contsel | contjoinsel
+---------------+-------------
+ customcontsel | contjoinsel
 (1 row)
 
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+                          ref                          | deptype 
+-------------------------------------------------------+---------
+ function alter_op_test_fn(boolean,boolean)            | n
+ function customcontsel(internal,oid,internal,integer) | n
+ schema public                                         | n
+(3 rows)
+
 --
 -- Test invalid options.
 --
@@ -73,3 +132,5 @@ ERROR:  must be owner of operator ===
 RESET SESSION AUTHORIZATION;
 DROP USER regtest_alter_user;
 DROP OPERATOR === (boolean, boolean);
+DROP FUNCTION customcontsel(internal, oid, internal, integer);
+DROP FUNCTION alter_op_test_fn(boolean, boolean);

src/test/regress/sql/alter_operator.sql

-CREATE OR REPLACE FUNCTION alter_op_test_fn(boolean, boolean)
+CREATE FUNCTION alter_op_test_fn(boolean, boolean)
 RETURNS boolean AS $$ SELECT NULL::BOOLEAN; $$ LANGUAGE sql IMMUTABLE;
 
+CREATE FUNCTION customcontsel(internal, oid, internal, integer)
+RETURNS float8 AS 'contsel' LANGUAGE internal STABLE STRICT;
+
 CREATE OPERATOR === (
     LEFTARG = boolean,
     RIGHTARG = boolean,
     PROCEDURE = alter_op_test_fn,
     COMMUTATOR = ===,
     NEGATOR = !==,
-    RESTRICT = contsel,
+    RESTRICT = customcontsel,
     JOIN = contjoinsel,
     HASHES, MERGES
 );
 
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+
 --
 -- Reset and set params
 --
@@ -22,22 +31,46 @@ ALTER OPERATOR === (boolean, boolean) SET (JOIN = NONE);
 SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
   AND oprleft = 'boolean'::regtype AND oprright = 'boolean'::regtype;
 
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+
 ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = contsel);
 ALTER OPERATOR === (boolean, boolean) SET (JOIN = contjoinsel);
 
 SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
   AND oprleft = 'boolean'::regtype AND oprright = 'boolean'::regtype;
 
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+
 ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = NONE, JOIN = NONE);
 
 SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
   AND oprleft = 'boolean'::regtype AND oprright = 'boolean'::regtype;
 
-ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = contsel, JOIN = contjoinsel);
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+
+ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = customcontsel, JOIN = contjoinsel);
 
 SELECT oprrest, oprjoin FROM pg_operator WHERE oprname = '==='
   AND oprleft = 'boolean'::regtype AND oprright = 'boolean'::regtype;
 
+SELECT pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype
+FROM pg_depend
+WHERE classid = 'pg_operator'::regclass AND
+      objid = '===(bool,bool)'::regoperator
+ORDER BY 1;
+
 --
 -- Test invalid options.
 --
@@ -60,3 +93,5 @@ ALTER OPERATOR === (boolean, boolean) SET (RESTRICT = NONE);
 RESET SESSION AUTHORIZATION;
 DROP USER regtest_alter_user;
 DROP OPERATOR === (boolean, boolean);
+DROP FUNCTION customcontsel(internal, oid, internal, integer);
+DROP FUNCTION alter_op_test_fn(boolean, boolean);