Fokko Driesprong created SPARK-31981: ----------------------------------------
Summary: Keep TimestampType when taking an average of a Timestamp Key: SPARK-31981 URL: https://issues.apache.org/jira/browse/SPARK-31981 Project: Spark Issue Type: Improvement Components: SQL Affects Versions: 3.0.0 Reporter: Fokko Driesprong Fix For: 3.1.0 Currently, when you take an average of a Timestamp, you'll end up with a Double, representing the seconds since epoch. This is because of old Hive behavior. I strongly believe that it is better to return a Timestamp. root@8c4241b617ec:/# psql postgres postgres psql (12.3 (Debian 12.3-1.pgdg100+1)) Type "help" for help. postgres=# CREATE TABLE timestamp_demo (ts TIMESTAMP); CREATE TABLE postgres=# INSERT INTO timestamp_demo VALUES('2019-01-01 18:22:11'); INSERT 0 1 postgres=# INSERT INTO timestamp_demo VALUES('2018-01-01 18:22:11'); INSERT 0 1 postgres=# INSERT INTO timestamp_demo VALUES('2017-01-01 18:22:11'); INSERT 0 1 postgres=# SELECT AVG(ts) FROM timestamp_demo; ERROR: function avg(timestamp without time zone) does not exist LINE 1: SELECT AVG(ts) FROM timestamp_demo; root@bab43a5731e8:/# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 9 Server version: 8.0.20 MySQL Community Server - GPL Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> CREATE TABLE timestamp_demo (ts TIMESTAMP); Query OK, 0 rows affected (0.05 sec) mysql> INSERT INTO timestamp_demo VALUES('2019-01-01 18:22:11'); Query OK, 1 row affected (0.01 sec) mysql> INSERT INTO timestamp_demo VALUES('2018-01-01 18:22:11'); Query OK, 1 row affected (0.01 sec) mysql> INSERT INTO timestamp_demo VALUES('2017-01-01 18:22:11'); Query OK, 1 row affected (0.01 sec) mysql> SELECT AVG(ts) FROM timestamp_demo; +---------------------+ | AVG(ts) | +---------------------+ | 20180101182211.0000 | +---------------------+ 1 row in set (0.00 sec) -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org