Github user srowen commented on the issue:
https://github.com/apache/spark/pull/17075
I dont' know the code well enough to really evaluate this, but, I see that
`.clone()` is called in a similar context in `decimalExpressions`. There are
also similar usages of `changePrecision` in `UnsafeArrayWriter` and
`UnsafeRowWriter`; I wonder if they are affected too?
CC maybe @cloud-fan or @yjshen ?
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