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https://issues.apache.org/jira/browse/FLINK-13378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16890991#comment-16890991
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Jingsong Lee commented on FLINK-13378:
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[~jark] Can you assign this one to me?
> Blink-planner not support SingleValueAggFunction
> ------------------------------------------------
>
> Key: FLINK-13378
> URL: https://issues.apache.org/jira/browse/FLINK-13378
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.9.0, 1.10.0
> Reporter: Louis Xu
> Priority: Blocker
> Fix For: 1.9.0, 1.10.0
>
>
> There some problem in SingleValueAggFunction:
> 1.The comment in the method is "value = count == 0 ? exception : operand(0)",
> but actually it need to be "value = count > 0 ? exception : operand(0)"
> according to the code and logic.
> 2.The throwException expression should call(THROW_EXCEPTION, literal(msg),
> typeLiteral(type)).
> And there are some bugs to support it in blink-planner:
> 1.RexNodeConverter lack converter for THROW_EXCEPTION
> 2.PlannerExpressions lack expr to support type inference for THROW_EXCEPTION
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