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https://issues.apache.org/jira/browse/CALCITE-5617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17726052#comment-17726052
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hufukang commented on CALCITE-5617:
-----------------------------------
select count(0) as total from (select m.USER_CODE, m.USER_NAME
from db1.user_info m left join db2.RECORD r on m.id = r.id)
> count() + left join execution efficiency optimize
> -------------------------------------------------
>
> Key: CALCITE-5617
> URL: https://issues.apache.org/jira/browse/CALCITE-5617
> Project: Calcite
> Issue Type: Task
> Reporter: hufukang
> Priority: Major
>
> {code:java}
> //代码占位符
> {code}
> SQL uses the count() aggregate function and uses left join to associate other
> tables, the execution efficiency is very slow, and try to optimize the
> aggregation function operator pushdown, hoping to put forward relevant
> optimization suggestions.
>
> *Test Demo:*
>
> {code:java}
> {code}
> *//代码占位符*
> **
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