Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/17684
To always use `BigDecimal` can make code simple. However, it always create
and keep an additional object (i.e. `BigDecimal`) even if value can be fit into
long value range.
This is a design choice: runtime efficiency with longer code v.s. simpler
code with runtime inefficiency.
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