Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19938
I prefer to generate new parameter name in `splitExpression` over
localizing global variables. There is no contract that an `Expression` must
output java variables, we may inline some values, e.g. we already output
`false` or `true` literal for `isNull`, and I roughly remember we do the same
thing for `value`, e.g. `a + 1` instead of a new java variable `c` which is
calculated by `c = a + 1`.
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