Add deserialization method for lockingclause

`create rule <...> do instead select * from t for update`
will dispatch a query with lockingclause node. Add
deserialization method for it to make things correct.

src/backend/nodes/readfast.c

@@ -2912,6 +2912,18 @@ _readLockRows(void)
 	READ_DONE();
 }
 
+static LockingClause *
+_readLockingClause(void)
+{
+	READ_LOCALS(LockingClause);
+
+	READ_NODE_FIELD(lockedRels);
+	READ_ENUM_FIELD(strength, LockClauseStrength);
+	READ_BOOL_FIELD(noWait);
+
+	READ_DONE();
+}
+
 static Node *
 _readValue(NodeTag nt)
 {
@@ -3851,6 +3863,9 @@ readNodeBinary(void)
 			case T_AlterTableMoveAllStmt:
 				return_value = _readAlterTableMoveAllStmt();
 				break;
+			case T_LockingClause:
+				return_value = _readLockingClause();
+				break;
 			default:
 				return_value = NULL; /* keep the compiler silent */
 				elog(ERROR, "could not deserialize unrecognized node type: %d",

src/test/regress/expected/rules.out

@@ -2727,3 +2727,7 @@ SELECT pg_get_functiondef('func_with_set_params()'::regprocedure);
  
 (1 row)
 
+-- test rule for select-for-update
+create table t_test_rules_select_for_update (c int) distributed randomly;
+create rule myrule as on insert to t_test_rules_select_for_update
+do instead select * from t_test_rules_select_for_update for update;

src/test/regress/sql/rules.sql

@@ -1035,3 +1035,8 @@ CREATE FUNCTION func_with_set_params() RETURNS integer
     SET search_path TO PG_CATALOG, "Mixed/Case", 'c:/''a"/path', '', '0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'
     IMMUTABLE STRICT;
 SELECT pg_get_functiondef('func_with_set_params()'::regprocedure);
+
+-- test rule for select-for-update
+create table t_test_rules_select_for_update (c int) distributed randomly;
+create rule myrule as on insert to t_test_rules_select_for_update
+do instead select * from t_test_rules_select_for_update for update;