Github user davies commented on the pull request:
https://github.com/apache/spark/pull/8018#issuecomment-129044057
Most of the performance improvement came from two parts:
1) call scala.math.Decimal.apply(MathContext) is heavy, right now we change
to java.math.BigDecimal.multiply(b, MathContext)
2) currently, when cast a numeric into decimal, we turn int/short/byte into
double, then cast double into decimal, it's expensive, now we change to call
Decimal(i.toLong)
other cleanups are not that necessary to the performance improvement, if
they are risky for the release, we can delay that in 1.6.
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