[jira] [Commented] (SPARK-21520) Improvement a special case for non-deterministic projects and filters in optimizer

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

    [ https://issues.apache.org/jira/browse/SPARK-21520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16119617#comment-16119617 ] 

caoxuewen commented on SPARK-21520:
-----------------------------------

User 'heary-cao' has created a pull request for this issue:
https://github.com/apache/spark/pull/18892

> Improvement a special case for non-deterministic projects and filters in optimizer
> ----------------------------------------------------------------------------------
>
>                 Key: SPARK-21520
>                 URL: https://issues.apache.org/jira/browse/SPARK-21520
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: caoxuewen
>
> Currently, Did a lot of special handling for non-deterministic projects and filters in optimizer. but not good enough. this patch add a new special case for non-deterministic projects and filters. Deal with that we only need to read user needs fields for non-deterministic projects and filters in optimizer.



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