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https://issues.apache.org/jira/browse/SPARK-8680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605747#comment-14605747
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Apache Spark commented on SPARK-8680:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/7087
> PropagateTypes is very slow when there are lots of columns
> ----------------------------------------------------------
>
> Key: SPARK-8680
> URL: https://issues.apache.org/jira/browse/SPARK-8680
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.3.1, 1.4.0
> Reporter: Davies Liu
>
> The time for PropagateTypes is O(N*N), N is the number of columns, which is
> very slow if there many columns (>1000)
> There easiest optimization could be put `q.inputSet` outside of
> transformExpressions which could have about 4 times improvement for N=3000
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