viirya commented on code in PR #7400:
URL: https://github.com/apache/arrow-datafusion/pull/7400#discussion_r1326506726
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datafusion/physical-expr/src/aggregate/first_last.rs:
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@@ -165,6 +165,8 @@ struct FirstValueAccumulator {
orderings: Vec<ScalarValue>,
// Stores the applicable ordering requirement.
ordering_req: LexOrdering,
+ // Whether merge_batch() is called before
Review Comment:
Hmm, why `state` call keeps adding new columns? I think it creates a new
`result` and pushes values in and returns it. `result` is not share between
`state` calls.
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