[jira] [Commented] (CALCITE-3144) Add rule, CaseFilteredAggregatorRule, that converts "SUM(CASE WHEN b THEN x END)" to "SUM(x) FILTER (WHERE b)"

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

    [ https://issues.apache.org/jira/browse/CALCITE-3144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16871685#comment-16871685 ] 

Haisheng Yuan commented on CALCITE-3144:
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I agree that it might be better to transform it in RelBuilder.aggregate instead of a rule.

> Add rule, CaseFilteredAggregatorRule, that converts "SUM(CASE WHEN b THEN x END)" to "SUM(x) FILTER (WHERE b)"
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-3144
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3144
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Priority: Major
>
> Add a rule that converts "SUM(CASE WHEN b THEN x END)" to "SUM\(x) FILTER (WHERE b)".
> Druid added {{CaseFilteredAggregatorRule}} in https://github.com/apache/incubator-druid/pull/4360.
> Maybe {{AggregateCaseToFilterRule}} is a slightly better name. Or maybe this transform could be done in {{RelBuilder.aggregate}}, and we wouldn't need a rule.



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