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https://issues.apache.org/jira/browse/FLINK-13378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16890908#comment-16890908
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Louis Xu commented on FLINK-13378:
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OK，it's good that you will resolve it.
> Wrong comment in SingleValueAggFunction.accumulateExpressions()
> ---------------------------------------------------------------
>
> 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
>
>
> 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.And the "throwException" expression's parameter msg is never used. And if
> we only think about "throwException" expression, the param "type" is the
> return type of agg function or msg's type? I don't known the definition of
> "throwException" expression, but I think this might be some problem.
> 3.If we need use param msg, the expression is call(THROW_EXCEPTION,
> literal(msg, type)) or
> call(THROW_EXCEPTION, literal(msg), typeLiteral(type)).
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