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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/01/22 04:59:00 UTC
[jira] [Commented] (SPARK-34199) Block `count(table.*)` to follow
ANSI standard and other SQL engines
[ https://issues.apache.org/jira/browse/SPARK-34199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269791#comment-17269791 ]
Apache Spark commented on SPARK-34199:
--------------------------------------
User 'linhongliu-db' has created a pull request for this issue:
https://github.com/apache/spark/pull/31286
> Block `count(table.*)` to follow ANSI standard and other SQL engines
> --------------------------------------------------------------------
>
> Key: SPARK-34199
> URL: https://issues.apache.org/jira/browse/SPARK-34199
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Linhong Liu
> Priority: Major
>
> In spark, the count(table.*) may cause very weird result, for example:
> select count(*) from (select 1 as a, null as b) t;
> output: 1
> select count(t.*) from (select 1 as a, null as b) t;
> output: 0
>
> After checking the ANSI standard, count(*) is always treated as count(1) while count(t.*) is not allowed. What's more, this is also not allowed by common databases, e.g. MySQL, oracle.
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