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https://issues.apache.org/jira/browse/FLINK-25476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17466700#comment-17466700
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zoucao commented on FLINK-25476:
--------------------------------
cc [~twalthr]
> CharType lost in the creation of MaxAggFunction & MinAggFunction
> ----------------------------------------------------------------
>
> Key: FLINK-25476
> URL: https://issues.apache.org/jira/browse/FLINK-25476
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.15.0
> Reporter: zoucao
> Priority: Major
>
> CharType lost in AggFunctionFactory#createMinAggFunction(Retract) and
> AggFunctionFactory#createMaxAggFunction(Retract&nonRetract).
> If execute
> {code:java}
> SELECT Max('a') ...
> {code}
> , The following exception will throw.
> ----
> Caused by: org.apache.flink.table.api.TableException: Max aggregate function
> does not support type: ''CHAR''.
> Please re-check the data type.
> at
> org.apache.flink.table.planner.plan.utils.AggFunctionFactory.createMaxAggFunction(AggFunctionFactory.scala:395)
> at
> org.apache.flink.table.planner.plan.utils.AggFunctionFactory.createAggFunction(AggFunctionFactory.scala:76)
> at
> org.apache.flink.table.planner.plan.utils.AggregateUtil$.$anonfun$transformToAggregateInfoList$1(AggregateUtil.scala:444)
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