alamb commented on pull request #7967:
URL: https://github.com/apache/arrow/pull/7967#issuecomment-678766915
@jorgecarleitao -- another thing I can think of would be to postpone the
UDF resolution until the type coercion logical optimizer pass.
So in other words, when converting `SQL` --> `LogicalPlan`we would postpone
populating `data_type` in `ScalarFunction` (or maybe have a
`ScalarFunctionPlaceholder` or something) that would not have a data_type. Then
we would add something to the type coercion logic that would resolve
`ScalarFunctionPlaceholder` to `ScalarFunction`.
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