Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19813
> Another solution is to not make this contract. By a quick look this seems
hard to do, because at the time of doing this, the code(method body) is already
generated and we don't know how to replace statement like a + 1 with the
generated parameter name, inside the method body. We may need to do this fix
earlier in the codegen procedure.
@cloud-fan Can you say more about this limitation? Can't we just replace
all occurrences of `a + 1` with a parameter name like `varA` in method body if
we are going to use it as parameter name in the split method?
E.g., from a method body like:
```scala
void splitMethod1(int a + 1, int b, boolean c) {
...
int d = a + 1 + b;
if (a + 1 > 10 && c) {
...
}
```
to
```scala
void splitMethod1(int varA, int b, boolean c) {
...
int d = varA + b;
if (varA > 10 && c) {
...
}
```
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