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https://issues.apache.org/jira/browse/CALCITE-6306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17824451#comment-17824451
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Julian Hyde commented on CALCITE-6306:
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Can you change the subject so it’s clear which calcite component this issue
affects? As currently written it sounds like a bug in MySQL.
> FILTER clauses for aggregate functions are not supported in MySQL, MariaDB
> and Starrocks
> ----------------------------------------------------------------------------------------
>
> Key: CALCITE-6306
> URL: https://issues.apache.org/jira/browse/CALCITE-6306
> Project: Calcite
> Issue Type: Bug
> Reporter: hongyu guo
> Priority: Minor
> Labels: pull-request-available
>
> {code:sql}
> mysql> select sum(x) filter (where x = 1) from t;
> ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
> that corresponds to your MySQL server version for the right syntax to use
> near '(where x = 1) from t' at line 1 {code}
> See details in https://modern-sql.com/feature/filter
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