andygrove opened a new pull request #7988:
URL: https://github.com/apache/arrow/pull/7988
This is a step towards cleaning up the handling of aggregate expressions and
acheives the following:
- It is now possible to construct a logical aggregate expression without
specifying a return data type, so we can now just say `min(col("foo"))` for
example.
- Removes the aggregate function methods from the `DataFrame` trait since
they are no longer needed
- Removes duplicate logic from `expr_to_field` that was determining the data
type of expressions rather than just calling `expr.get_type`
- Removes hard-coded return types from tests
- Adds the new min, max, avg, count, sum functions to prelude.rs
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