viirya commented on PR #5675:
URL: 
https://github.com/apache/arrow-datafusion/pull/5675#issuecomment-1500517561

   > Does this new `PromotePrecision` expr only apply to Decimal type?
   > I remember in the SparkSQL there was a similar `PromotePrecision`, not 
sure whether it is for the same purpose.
   > And looks like in the latest Spark, it is removed or renamed.
   
   It is for Decimal type only. Yea, the idea is from Spark.
   
   It was removed in latest Spark as the precision promotion is moved to where 
the computation happens. I was not sure if moving it into decimal kernels is a 
good idea for DataFusion. Let me re-think about it and maybe refactor this.
   
   


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