beliefer opened a new pull request, #37830:
URL: https://github.com/apache/spark/pull/37830

   ### What changes were proposed in this pull request?
   This PR used to improve the implementation of Spark `Decimal`. The 
improvement points are as follows:
   1. In many places of Spark `Decimal`, `ne` is first used instead of `eq`. 
According to the document of `scala.AnyRef`, `ne is equivalent to !(this eq 
that)`
   2. Use `toJavaBigDecimal` instead of  `toBigDecimal.bigDecimal` 
   3. Extract `longVal / POW_10(_scale)` as a new method `def actualLongVal: 
Long`
   4. Remove `BIG_DEC_ZERO` and use `decimalVal.signum` to judge whether or not 
equals zero.
   5. Simplify some code. 
   
   ### Why are the changes needed?
   Improve the implementation of Spark Decimal
   
   
   ### Does this PR introduce _any_ user-facing change?
   'No'.
   Just update the inner implementation.
   
   
   ### How was this patch tested?
   N/A
   


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