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https://issues.apache.org/jira/browse/FLINK-27145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jingsong Lee reassigned FLINK-27145:
------------------------------------
Assignee: luoyuxia
> The code generated for agg function accepts empty parameters can't be compiled
> ------------------------------------------------------------------------------
>
> Key: FLINK-27145
> URL: https://issues.apache.org/jira/browse/FLINK-27145
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: luoyuxia
> Assignee: luoyuxia
> Priority: Major
> Fix For: 1.16.0
>
>
> In batch mode, when I try to call Hive's `count` function(GenericUDAFCount)
> using the following sql:
> {code:java}
> select count(*) from src;
> {code}
> It'll throw the exception "Unexpected token ")" in primary" while compling
> the generated code.
> It happens in the following generated code:
> {code:java}
> function_org$apache$flink$table$planner$utils$xxx.accumulate(
> acc$7,); {code}
>
> The reason is the following code in method
> `AggCodeGenHelper#genAccumulateFlatAggregateBuffer`
> {code:java}
> s"""
> |$externalAccTypeTerm $externalAccTerm = $externalAccCode;
> |${functionIdentifiers(function)}.accumulate(
> | $externalAccTerm,
> | ${operandTerms.mkString(", ")}); // but operandTerms can be empty list
> |$aggBufferName = ${genToInternalConverter(ctx,
> externalAccType)(externalAccTerm)};
> |${aggBufferExpr.nullTerm} = false;
> """.stripMargin {code}
> In this case, for count(\*), it'll be regarded as an agg function with empty
> parameter in Hive.
> So, the exception happens.
> Although the agg function with empty parameter is rare, it may happens. We
> should make the code more rubst.
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