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https://issues.apache.org/jira/browse/DRILL-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149576#comment-15149576
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ASF GitHub Bot commented on DRILL-4372:
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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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