Adding test changes in alter_table_optimizer.out for fixing tuple descriptor...

Adding test changes in alter_table_optimizer.out for fixing tuple descriptor leak in split_rows during an ALTER TABLE SPLIT PARTITION.

src/test/regress/expected/alter_table_optimizer.out

@@ -2391,3 +2391,27 @@ NOTICE:  drop cascades to constraint testbug_char5_1_prt_part201204_check on app
 NOTICE:  drop cascades to append only columnar table mpp17582.testbug_char5_1_prt_part201203
 NOTICE:  drop cascades to constraint testbug_char5_1_prt_part201203_check on append only columnar table mpp17582.testbug_char5_1_prt_part201203
 NOTICE:  drop cascades to table mpp17582.testbug_char5
+-- Test for tuple descriptor leak during row splitting
+DROP TABLE IF EXISTS split_tupdesc_leak;
+NOTICE:  table "split_tupdesc_leak" does not exist, skipping
+CREATE TABLE split_tupdesc_leak
+(
+   ym character varying(6) NOT NULL,
+   suid character varying(50) NOT NULL,
+   genre_ids character varying(20)[]
+) 
+WITH (APPENDONLY=true, ORIENTATION=row, COMPRESSTYPE=zlib, OIDS=FALSE)
+DISTRIBUTED BY (suid)
+PARTITION BY LIST(ym)
+(
+	DEFAULT PARTITION p_split_tupdesc_leak_ym  WITH (appendonly=true, orientation=row, compresstype=zlib)
+);
+NOTICE:  CREATE TABLE will create partition "split_tupdesc_leak_1_prt_p_split_tupdesc_leak_ym" for table "split_tupdesc_leak"
+INSERT INTO split_tupdesc_leak VALUES ('201412','0001EC1TPEvT5SaJKIR5yYXlFQ7tS','{0}');
+ALTER TABLE split_tupdesc_leak SPLIT DEFAULT PARTITION AT ('201412')
+	INTO (PARTITION p_split_tupdesc_leak_ym, PARTITION p_split_tupdesc_leak_ym_201412);
+NOTICE:  exchanged partition "p_split_tupdesc_leak_ym" of relation "split_tupdesc_leak" with relation "pg_temp_323542"
+NOTICE:  dropped partition "p_split_tupdesc_leak_ym" for relation "split_tupdesc_leak"
+NOTICE:  CREATE TABLE will create partition "split_tupdesc_leak_1_prt_p_split_tupdesc_leak_ym_201412" for table "split_tupdesc_leak"
+NOTICE:  CREATE TABLE will create partition "split_tupdesc_leak_1_prt_p_split_tupdesc_leak_ym" for table "split_tupdesc_leak"
+DROP TABLE split_tupdesc_leak;