ulysses-you opened a new pull request, #37207:
URL: https://github.com/apache/spark/pull/37207
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### What changes were proposed in this pull request?
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Add a new expression `DecimalDivideWithOverflowCheck` to replace the
previous CheckOverflowInSum + Divide + Cast.
### Why are the changes needed?
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If the result data type is decimal, the Average will first calculate the
result using the default precison and scale of divide, then cast to the result
data type. We should do calculate and return the result data type directly so
that we can avoid the precision loss. It can also save one unnecessary cast.
And for the overflow check, we should check the result of divide whether
overflow instead of the dividend.
### Does this PR introduce _any_ user-facing change?
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yes, a small bug fix
### How was this patch tested?
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add a test and fix test
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