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https://issues.apache.org/jira/browse/SPARK-13404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15154559#comment-15154559
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Apache Spark commented on SPARK-13404:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/11274
> Create the variables for input when it's used
> ---------------------------------------------
>
> Key: SPARK-13404
> URL: https://issues.apache.org/jira/browse/SPARK-13404
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> Right now, we create the variables in the first operator (usually
> InputAdapter), they could be wasted if most of rows after filtered out
> immediately.
> We should defer that until they are used by following operators.
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