[jira] [Commented] (DRILL-4372) Let Operators and Functions expose the types

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149576#comment-15149576 ] 

ASF GitHub Bot commented on DRILL-4372:
---------------------------------------

Github user hsuanyi commented on the pull request:

    https://github.com/apache/drill/pull/370#issuecomment-184940494
  
    Will send out a rebased and updated code shortly


> Let Operators and Functions expose the types 
> ---------------------------------------------
>
>                 Key: DRILL-4372
>                 URL: https://issues.apache.org/jira/browse/DRILL-4372
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Query Planning & Optimization
>            Reporter: Sean Hsuan-Yi Chu
>            Assignee: Sean Hsuan-Yi Chu
>
> Currently, for most operators / functions, Drill would always claim the return types being nullable-any. 
> However, in many cases (such as Hive, View, etc.), the types of input columns are known. So, along with resolving to the correct operators / functions, we can infer the output types at planning. 
> Having this mechanism can help speed up many applications, especially where schemas alone are sufficient (e.g., Limit-0).



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