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avg(decimal) might lose precision and cause an overflow over return type #24369

Description

@AdamGS

Describe the bug

The return type for avg(decimal) is currently Decimal(p + 4, s + 4), saturating at the width's max size.
For columns that have a precision that is close to the variant's maximum precision, the output might not fit into the return type, resulting in an overflow.

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Expected behavior

Averages shouldn't overflow at that last step, especially as this is a predictable output.

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