[jira] [Commented] (CALCITE-3159) Distinct can be removed for MIN/MAX/BIT_OR/BIT_AND aggregate functions

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

    [ https://issues.apache.org/jira/browse/CALCITE-3159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905717#comment-16905717 ] 

Julian Hyde commented on CALCITE-3159:
--------------------------------------

Reviewing now. Will commit shortly.

> Distinct can be removed for MIN/MAX/BIT_OR/BIT_AND aggregate functions
> ----------------------------------------------------------------------
>
>                 Key: CALCITE-3159
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3159
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Haisheng Yuan
>            Assignee: Julian Hyde
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 3h 10m
>  Remaining Estimate: 0h
>
> For the following query:
> {code:java}
> select a, min(distinct b), bit_or(distinct c) from foo group by a;
> {code}
> Currently Calcite still preserve the distinct for these aggregate functions, but DISTINCT is not meaningful with MIN/MAX and is available for ISO compatibility only. We can safely remove distinct and get more optimization opportunities.



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