Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22494
oh, I see now the problem. And it is much bigger than I thought, sorry.
Here we were returning a negative scale for `1e6` (it happens in the
`AstBuilder`, as we build a BigDecimal from it) also before the change in
#20023. But before we had a very high (unneeded) precision for `1000`, which
"fixed" the issue with the negative scale. This means that we were lucky in
that specific query. If you try, for instance, `select 26393499451 / 1000e6`,
then this fails also with your fix and before #20023. So this is not a solution
either, I think.
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