fe2s commented on code in PR #39099:
URL: https://github.com/apache/spark/pull/39099#discussion_r1057810986
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sql/catalyst/src/main/scala/org/apache/spark/sql/types/Decimal.scala:
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@@ -374,7 +374,7 @@ final class Decimal extends Ordered[Decimal] with
Serializable {
if (scale < _scale) {
// Easier case: we just need to divide our scale down
val diff = _scale - scale
- val pow10diff = POW_10(diff)
+ val pow10diff = POW_10(math.min(diff, MAX_LONG_DIGITS))
Review Comment:
Compact long can still be used when `diff > MAX_LONG_DIGITS`. In this case
`longVal` becomes `0`, `1` or `-1` depending on rounding, so using `BigDecimal`
is not actually needed.
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