Github user ericl commented on the pull request:
https://github.com/apache/spark/pull/12490#issuecomment-212209007
It seems this is the failing test. @davies any idea why the decimal
handling is wrong here? If I am understanding correctly when `dt.precision -
dt.scale <= Decimal.MAX_LONG_DIGITS`, the unscaled long value should be enough
for sorting.
```
[info] !0.9999999999999999999999999 2.9999999999999999999999997 1
3
[info] 1 3 1
3
[info] !1 3
0.9999999999999999999999999 2.9999999999999999999999997
```
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