function has serial type 测试用例

src/test/regress/sql/test_serial.sql

@@ -0,0 +1,44 @@
+--
+-- testserial
+--
+create table tbl_small_serial(a smallserial, b varchar(2));
+
+insert into tbl_small_serial(b) values ('aa');
+
+create table tbl_serial(a serial, b varchar(2));
+
+insert into tbl_serial(b) values ('bb');
+
+create table tbl_big_serial(a bigserial, b varchar(2));
+
+insert into tbl_big_serial(b) values ('cc');
+
+CREATE  FUNCTION h_testfun6 (c_SMALLSERIAL SMALLSERIAL) RETURNS SMALLSERIAL   AS $$
+        BEGIN
+                RETURN c_SMALLSERIAL+1 ;
+        END;
+$$ LANGUAGE plpgsql;
+CREATE  FUNCTION h_testfun7 (c_SERIAL SERIAL) RETURNS SERIAL   AS $$
+        BEGIN
+                RETURN c_SERIAL ;
+        END;
+$$ LANGUAGE plpgsql;
+CREATE  FUNCTION h_testfun8 (c_BIGSERIAL BIGSERIAL) RETURNS BIGSERIAL   AS $$
+        BEGIN
+                RETURN c_BIGSERIAL ;
+        END;
+$$ LANGUAGE plpgsql;
+
+SELECT h_testfun6((SELECT a from  tbl_small_serial));
+
+SELECT h_testfun7((SELECT a from  tbl_serial));
+
+SELECT h_testfun8((SELECT a from  tbl_big_serial));
+
+drop table tbl_small_serial;
+drop table tbl_serial;
+drop table tbl_big_serial;
+
+drop function h_testfun6;
+drop function h_testfun7;
+drop function h_testfun8;