HIVE-27994: Optimize renaming the partitioned table (#4995) (Zhihua D…

…eng, reviewed by Butao Zhang, Sai Hemanth Gantasala)

ql/src/test/queries/clientpositive/rename_table.q

@@ -0,0 +1,40 @@
+--! qt:dataset:src
+--! qt:dataset:part
+-- This test verifies that if the table after rename can still fetch the column statistics
+set hive.stats.kll.enable=true;
+set metastore.stats.fetch.bitvector=true;
+set metastore.stats.fetch.kll=true;
+set hive.stats.autogather=true;
+set hive.stats.column.autogather=true;
+
+CREATE TABLE rename_partition_table0 (key STRING, value STRING) PARTITIONED BY (part STRING)
+STORED AS ORC;
+
+INSERT OVERWRITE TABLE rename_partition_table0 PARTITION (part = '1') SELECT * FROM src where rand(1) < 0.5;
+ALTER TABLE rename_partition_table0 ADD COLUMNS (new_col INT);
+INSERT OVERWRITE TABLE rename_partition_table0 PARTITION (part = '2') SELECT src.*, 1 FROM src;
+
+ALTER TABLE rename_partition_table0 RENAME TO rename_partition_table1;
+DESCRIBE FORMATTED rename_partition_table1;
+DESCRIBE FORMATTED rename_partition_table1 PARTITION (part='1') key;
+DESCRIBE FORMATTED rename_partition_table1 PARTITION (part='1') value;
+DESCRIBE FORMATTED rename_partition_table1 PARTITION (part='2') key;
+DESCRIBE FORMATTED rename_partition_table1 PARTITION (part='2') value;
+DESCRIBE FORMATTED rename_partition_table1 PARTITION (part='2') new_col;
+
+CREATE EXTERNAL TABLE rename_partition_table_ext0 (key STRING, value STRING) PARTITIONED BY (part STRING)
+STORED AS ORC;
+
+INSERT OVERWRITE TABLE rename_partition_table_ext0 PARTITION (part = '1') SELECT * FROM src where rand(1) < 0.5;
+ALTER TABLE rename_partition_table_ext0 CHANGE COLUMN value val STRING CASCADE;
+INSERT OVERWRITE TABLE rename_partition_table_ext0 PARTITION (part = '2') SELECT * FROM src;
+
+ALTER TABLE rename_partition_table_ext0 RENAME TO rename_partition_table_ext1;
+DESCRIBE FORMATTED rename_partition_table_ext1;
+DESCRIBE FORMATTED rename_partition_table_ext1 PARTITION (part='1') key;
+DESCRIBE FORMATTED rename_partition_table_ext1 PARTITION (part='1') val;
+DESCRIBE FORMATTED rename_partition_table_ext1 PARTITION (part='2') key;
+DESCRIBE FORMATTED rename_partition_table_ext1 PARTITION (part='2') val;
+
+DROP TABLE rename_partition_table1;
+DROP TABLE rename_partition_table_ext1;