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https://issues.apache.org/jira/browse/FLINK-40844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vas Shabu updated FLINK-40844:
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Component/s: Table SQL / Planner
> Planner inserting a ghost column when all rows are partition keys
> -----------------------------------------------------------------
>
> Key: FLINK-40844
> URL: https://issues.apache.org/jira/browse/FLINK-40844
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Vas Shabu
> Priority: Major
>
> While adding EXPR$0 handling for PTFs, we found SystemTypeInference always
> falls back to a phantom EXPR$0 column whenever the function's own output is
> empty — even when PARTITION BY or rowtime columns already populate the row:
> - deriveFunctionOutputFields returns EXPR$0 unconditionally for an empty
> function output, without checking whether pass-through/rowtime columns
> already contributed fields.
> - This produces a wrong resolved schema (extra column) and a codegen arity
> mismatch whenever an empty-output PTF is combined with PARTITION BY.
> - Fix: only fall back to EXPR$0 when the whole assembled output row
> (pass-through + function output + rowtime) is empty.
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