jorgecarleitao commented on a change in pull request #7988:
URL: https://github.com/apache/arrow/pull/7988#discussion_r472221795
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File path: rust/datafusion/src/logicalplan.rs
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@@ -363,8 +335,6 @@ pub enum Expr {
name: String,
/// List of expressions to feed to the functions as arguments
args: Vec<Expr>,
- /// The `DataType` the expression will yield
- return_type: DataType,
Review comment:
I agree with this: we need two interfaces: one internal that supports
variable types, so that we abstract out the hard-coded return types and make
them functions of the expression, and a public one for users to declared
fixed-type UDFs.
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