[jira] [Created] (SPARK-31981) Keep TimestampType when taking an average of a Timestamp

["Fokko Driesprong (Jira)" <ji...@apache.org>]

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)

 

 

 

 



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