jayzhan211 commented on code in PR #9304:
URL: https://github.com/apache/arrow-datafusion/pull/9304#discussion_r1505182329
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datafusion/core/tests/user_defined/user_defined_scalar_functions.rs:
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@@ -498,6 +503,83 @@ async fn test_user_defined_functions_zero_argument() ->
Result<()> {
Ok(())
}
+#[derive(Debug)]
+struct CastToI64UDF {
+ signature: Signature,
+}
+
+impl CastToI64UDF {
+ fn new() -> Self {
+ Self {
+ signature: Signature::any(1, Volatility::Immutable),
+ }
+ }
+}
+
+impl ScalarUDFImpl for CastToI64UDF {
+ fn as_any(&self) -> &dyn Any {
+ self
+ }
+ fn name(&self) -> &str {
+ "cast_to_i64"
+ }
+ fn signature(&self) -> &Signature {
+ &self.signature
+ }
+ fn return_type(&self, _args: &[DataType]) -> Result<DataType> {
+ Ok(DataType::Int64)
+ }
+ // Wrap with Expr::Cast() to Int64
+ fn simplify(&self, args: &[Expr]) -> Result<Simplified> {
+ let dfs = DFSchema::new_with_metadata(
Review Comment:
SimpliyContext has DFSchemaRef, so I change the type to DFSchemaRef, I think
it is also fine
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