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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/06/13 09:54:00 UTC
[jira] [Commented] (SPARK-31981) Keep TimestampType when taking an
average of a Timestamp
[ https://issues.apache.org/jira/browse/SPARK-31981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134716#comment-17134716 ]
Apache Spark commented on SPARK-31981:
--------------------------------------
User 'Fokko' has created a pull request for this issue:
https://github.com/apache/spark/pull/28821
> 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
> Priority: Major
> 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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