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https://issues.apache.org/jira/browse/SPARK-22719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16280501#comment-16280501
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Apache Spark commented on SPARK-22719:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/19912
> refactor ConstantPropagation
> ----------------------------
>
> Key: SPARK-22719
> URL: https://issues.apache.org/jira/browse/SPARK-22719
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Gengliang Wang
>
> The current time complexity of ConstantPropagation is O(n^2), which can be
> slow when the query is complex.
> Refactor the implementation with O( n ) time complexity
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