[jira] [Resolved] (SPARK-14502) Add optimization for Binary Comparison Simplification

["Davies Liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davies Liu resolved SPARK-14502.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

Issue resolved by pull request 12267
[https://github.com/apache/spark/pull/12267]

> Add optimization for Binary Comparison Simplification
> -----------------------------------------------------
>
>                 Key: SPARK-14502
>                 URL: https://issues.apache.org/jira/browse/SPARK-14502
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Dongjoon Hyun
>             Fix For: 2.0.0
>
>
> We can simplifies binary comparisons with semantically-equal operands:
> 1) Replace '<=>' with 'true' literal.
> 2) Replace '=', '<=', and '>=' with 'true' literal if both operands are non-nullable.
> 3) Replace '<' and '>' with 'false' literal if both operands are non-nullable.
> For example, the following example plan
> {code}
> scala> sql("SELECT * FROM (SELECT explode(array(1,2,3)) a) T WHERE a BETWEEN a AND a+7").explain()
> ...
> :  +- Filter ((a#59 >= a#59) && (a#59 <= (a#59 + 7)))
> ...
> {code}
> will be optimized into the following.
> {code}
> :  +- Filter (a#47 <= (a#47 + 7))
> {code}



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