jorgecarleitao commented on a change in pull request #8836:
URL: https://github.com/apache/arrow/pull/8836#discussion_r536874229
##########
File path: rust/datafusion/src/physical_plan/udf.rs
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@@ -56,6 +56,12 @@ impl Debug for ScalarUDF {
}
}
+impl PartialEq for ScalarUDF {
+ fn eq(&self, other: &Self) -> bool {
+ self.name == other.name && self.signature == other.signature
Review comment:
I am afraid that this may not be sufficient: two UDFs may have the same
name and signature and represent different semantics. In general UDFs are
anonymous functions and thus do not have a `partialEq`. If we base equality on
`name` and two UDFs are assigned the same name, there will be a semantic error
in this equality.
Note that while this can't happen in SQL, because UDFs are registered via
`register_udf(name, ...)`, the DataFrame API supports using bypassing the
context and calling UDFs without registering them on the context.
In the `simple_udf.rs` example, the line
```rust
let expr1 = pow.call(vec![col("a"), col("b")]);
```
demonstrates how to use a UDF without registering it on the context, in
which case its name is only used when printing the plan.
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