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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/08/03 23:53:04 UTC
[jira] [Reopened] (SPARK-9372) For a join operator, rows with null
equal join key expression can be filtered out early
[ https://issues.apache.org/jira/browse/SPARK-9372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Reynold Xin reopened SPARK-9372:
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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.
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