alamb commented on code in PR #8055:
URL: https://github.com/apache/arrow-datafusion/pull/8055#discussion_r1386969674


##########
datafusion/physical-expr/src/aggregate/array_agg_distinct.rs:
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@@ -48,12 +50,14 @@ impl DistinctArrayAgg {
         expr: Arc<dyn PhysicalExpr>,
         name: impl Into<String>,
         input_data_type: DataType,
+        is_expr_nullable: bool,

Review Comment:
   should we perhaps update the docstrings here to explain `is_expr_nullable` 
means if the input can have nulls?



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