mingmwang commented on code in PR #5866:
URL: https://github.com/apache/arrow-datafusion/pull/5866#discussion_r1160604767
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datafusion/physical-expr/src/aggregate/utils.rs:
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@@ -31,3 +33,49 @@ pub fn get_accum_scalar_values_as_arrays(
.map(|s| s.to_array_of_size(1))
.collect::<Vec<_>>())
}
+
+pub fn calculate_result_decimal_for_avg(
Review Comment:
I think it is a little bit different then the explicit arithmetic expression
in the SQL, the reason is this final result decimal conversion is implicit,
the logical plans/optimizers actually are not aware of this implicit
conversion. This is similar to the implicit `cast` that I pulled up this PR,
the cast is also implicit and the logical plans/optimizers are not aware of
this implicit `cast` either. Those implicit `cast` and conversions are only
related to internal state of some specific Aggregation `Accumulator`, they are
not part of the SQL plans/expressions tree.
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