Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/12850
UDF is the first thing I came out, and yes, it must be deterministic. But
as we have the `deterministic` property in `Expression`, I think it's possible
for users to create non-deterministic expressions, e.g. `ScalaUDAF`, or other
API we may create in the future, then the execution order matters.
You can still improve this PR to handle non-deterministic cases, but that
will make this PR more complex and harder to reason about, which may not worth.
cc @davies
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