[
https://issues.apache.org/jira/browse/SPARK-9372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Reynold Xin reopened SPARK-9372:
--------------------------------
I reverted the merged patch since it had a few problems.
> For a join operator, rows with null equal join key expression can be filtered
> out early
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-9372
> URL: https://issues.apache.org/jira/browse/SPARK-9372
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> Taking {{select ... from A join B on (A.key = B.key)}} as an example, we can
> filter out rows that have null values for column A.key/B.key because those
> rows do not contribute to the result of the output.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
