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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-5710) Combines two adjacent `Cast` expressions into one
Date Tue, 10 Feb 2015 07:15:34 GMT

    [ https://issues.apache.org/jira/browse/SPARK-5710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313729#comment-14313729
] 

Apache Spark commented on SPARK-5710:
-------------------------------------

User 'guowei2' has created a pull request for this issue:
https://github.com/apache/spark/pull/4497

> Combines two adjacent `Cast` expressions into one
> -------------------------------------------------
>
>                 Key: SPARK-5710
>                 URL: https://issues.apache.org/jira/browse/SPARK-5710
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.3.0
>            Reporter: guowei
>
> A plan after `analyzer` with `typeCoercionRules` may produce many `cast` expressions.
we can combine the adjacent ones.
> For example. 
> create table test(a decimal(3,1));
> explain select * from test where a*2-1>1;
> == Physical Plan ==
> Filter (CAST(CAST((CAST(CAST((CAST(a#5, DecimalType()) * 2), DecimalType(21,1)), DecimalType())
- 1), DecimalType(22,1)), DecimalType()) > 1)
>  HiveTableScan [a#5], (MetastoreRelation default, test, None), None



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