mustafasrepo commented on code in PR #6503:
URL: https://github.com/apache/arrow-datafusion/pull/6503#discussion_r1212317393
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datafusion/physical-expr/src/aggregate/first_last.rs:
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@@ -112,25 +112,35 @@ impl PartialEq<dyn Any> for FirstValue {
#[derive(Debug)]
struct FirstValueAccumulator {
first: ScalarValue,
+ // At the beginning, `is_set` is `false`, this means `first` is not seen
yet.
+ // Once we see (`is_set=true`) first value, we do not update `first`.
+ is_set: bool,
Review Comment:
I have considered this option, however, during `evaluate` call if `first` is
`None`. We need to return `NULL` for appropriate type, such as
`ScalarValue::Int64(None)` if type is `Int64`. However, datatype is only
available during initialization. If we want to use `Option` for `first`, we may
need to store data type also. Hence I opted for this approach
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