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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:16:40 UTC

[jira] [Resolved] (SPARK-19902) Support more expression canonicalization: Add, Subtract, Multiply and Divide

     [ https://issues.apache.org/jira/browse/SPARK-19902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-19902.
----------------------------------
    Resolution: Incomplete

> 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
>            Priority: Major
>              Labels: bulk-closed
>
> 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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