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https://issues.apache.org/jira/browse/SPARK-19902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15905104#comment-15905104
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Apache Spark commented on SPARK-19902:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/17242
> Support more expression canonicalization: Add, Subtract, Multiply and Divide
> ----------------------------------------------------------------------------
>
> Key: SPARK-19902
> URL: https://issues.apache.org/jira/browse/SPARK-19902
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Liang-Chi Hsieh
>
> Current expression canonicalization can't support even simple cases like a +
> b - b and a which are semantically equal. Since expression canonicalization
> is used across Spark SQL, more supports can be useful.
> This patch adds more expression canonicalization support. In particular, it
> supports the expressions composed of combination of Add and Subtract, and
> combination of Multiply and Divide.
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