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https://issues.apache.org/jira/browse/SPARK-20758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011674#comment-16011674
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Apache Spark commented on SPARK-20758:
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User 'tejasapatil' has created a pull request for this issue:
https://github.com/apache/spark/pull/17993
> Add Constant propagation optimization
> -------------------------------------
>
> Key: SPARK-20758
> URL: https://issues.apache.org/jira/browse/SPARK-20758
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.1
> Reporter: Tejas Patil
> Priority: Minor
>
> Constant propagation involves substituting attributes which can be statically
> evaluated in expressions. Its a pretty common optimization in compilers world.
> eg.
> {noformat}
> SELECT * FROM table WHERE i = 5 AND j = i + 3
> {noformat}
> can be re-written as:
> {noformat}
> SELECT * FROM table WHERE i = 5 AND j = 8
> {noformat}
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