alamb commented on code in PR #14094:
URL: https://github.com/apache/datafusion/pull/14094#discussion_r1920358041
##########
datafusion/expr/src/udf.rs:
##########
@@ -342,6 +348,56 @@ pub struct ScalarFunctionArgs<'a> {
pub return_type: &'a DataType,
}
+#[derive(Debug)]
+pub struct ReturnTypeArgs<'a> {
Review Comment:
Here are some suggestions to improve the comments:
```suggestion
/// Arguments passed to [`ScalarUDFImpl::return_type_from_args`]
#[derive(Debug)]
pub struct ReturnTypeArgs<'a> {
```
##########
datafusion/expr/src/udf.rs:
##########
@@ -342,6 +348,56 @@ pub struct ScalarFunctionArgs<'a> {
pub return_type: &'a DataType,
}
+#[derive(Debug)]
+pub struct ReturnTypeArgs<'a> {
+ /// The data types of the arguments to the function
+ pub arg_types: &'a [DataType],
+ /// The Utf8 arguments to the function, if the expression is not Utf8, it
will be empty string
Review Comment:
If possible I suggest using the following type:
1. It can distinguish between string/non-string arguments
3. It avoids clones
```rust
pub arguments: &'a [Option<&'a ScalarValue>]>`,
```
##########
datafusion/expr/src/udf.rs:
##########
@@ -490,6 +547,40 @@ pub trait ScalarUDFImpl: Debug + Send + Sync {
self.return_type(arg_types)
}
+ /// What [`DataType`] will be returned by this function, given the
Review Comment:
I also recommend removing the comments from `return_type_from_exprs` now
that it is deprecated and you have moved the content here
##########
datafusion/expr/src/udf.rs:
##########
@@ -481,6 +537,7 @@ pub trait ScalarUDFImpl: Debug + Send + Sync {
/// This function must consistently return the same type for the same
/// logical input even if the input is simplified (e.g. it must return the
same
/// value for `('foo' | 'bar')` as it does for ('foobar').
+ #[deprecated(since = "45.0.0", note = "Use `return_type_from_args`
instead")]
Review Comment:
Can you also please update the comments on `return_type` to refer to
`return_type_from_args` (it currently talks about `return_type_from_exprs`:
```rust
/// If you provide an implementation for
[`Self::return_type_from_exprs`],
/// DataFusion will not call `return_type` (this function). In this case
it
/// is recommended to return [`DataFusionError::Internal`].
```
##########
datafusion/functions/src/core/named_struct.rs:
##########
@@ -44,11 +44,18 @@ fn named_struct_expr(args: &[ColumnarValue]) ->
Result<ColumnarValue> {
.chunks_exact(2)
.enumerate()
.map(|(i, chunk)| {
-
let name_column = &chunk[0];
let name = match name_column {
- ColumnarValue::Scalar(ScalarValue::Utf8(Some(name_scalar))) =>
name_scalar,
- _ => return exec_err!("named_struct even arguments must be
string literals, got {name_column:?} instead at position {}", i * 2)
+ ColumnarValue::Scalar(ScalarValue::Utf8(Some(name_scalar))) =>
{
+ name_scalar
+ }
+ // TODO: Implement Display for ColumnarValue
Review Comment:
That is a good todo -- maybe we can make a follow on ticket for it
##########
datafusion/functions/src/core/coalesce.rs:
##########
@@ -174,39 +177,3 @@ fn get_coalesce_doc() -> &'static Documentation {
.build()
})
}
-
-#[cfg(test)]
Review Comment:
why remove these tests?
##########
datafusion/physical-expr/src/scalar_function.rs:
##########
@@ -83,6 +86,53 @@ impl ScalarFunctionExpr {
}
}
+ /// Create a new Scalar function
+ pub fn try_new(
+ fun: Arc<ScalarUDF>,
+ args: Vec<Arc<dyn PhysicalExpr>>,
+ schema: &Schema,
+ ) -> Result<Self> {
+ let name = fun.name().to_string();
+ let arg_types = args
+ .iter()
+ .map(|e| e.data_type(schema))
+ .collect::<Result<Vec<_>>>()?;
+
+ // verify that input data types is consistent with function's
`TypeSignature`
+ data_types_with_scalar_udf(&arg_types, &fun)?;
+
+ let nullables = args
+ .iter()
+ .map(|e| e.nullable(schema))
+ .collect::<Result<Vec<_>>>()?;
+
+ let arguments: Vec<String> = args
+ .iter()
+ .map(|e| {
+ e.as_any()
+ .downcast_ref::<Literal>()
+ .map(|literal| match literal.value() {
+ ScalarValue::Utf8(Some(s)) => s.clone(),
Review Comment:
It would be really nice to avoid this clone here -- if we changed the
signature to `&[Option<&str>]` I think that would be easier to use and more
efficient
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