viirya commented on code in PR #9031:
URL: https://github.com/apache/arrow-datafusion/pull/9031#discussion_r1470303689
##########
datafusion/core/tests/user_defined/user_defined_scalar_functions.rs:
##########
@@ -392,6 +396,112 @@ async fn test_user_defined_functions_with_alias() ->
Result<()> {
Ok(())
}
+#[derive(Debug)]
+pub struct RandomUDF {
+ signature: Signature,
+}
+
+impl RandomUDF {
+ pub fn new() -> Self {
+ Self {
+ signature: Signature::one_of(
+ vec![Any(0), Variadic(vec![Float64])],
+ Volatility::Volatile,
+ ),
+ }
+ }
+}
+
+impl ScalarUDFImpl for RandomUDF {
+ fn as_any(&self) -> &dyn std::any::Any {
+ self
+ }
+
+ fn name(&self) -> &str {
+ "random_udf"
+ }
+
+ fn signature(&self) -> &Signature {
+ &self.signature
+ }
+
+ fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
+ Ok(Float64)
+ }
+
+ fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> {
+ let len: usize = match &args[0] {
+ ColumnarValue::Array(array) => array.len(),
+ _ => {
+ return Err(datafusion::error::DataFusionError::Internal(
+ "Invalid argument type".to_string(),
+ ))
+ }
+ };
+ let mut rng = thread_rng();
+ let values = iter::repeat_with(|| rng.gen_range(0.1..1.0)).take(len);
+ let array = Float64Array::from_iter_values(values);
+ Ok(ColumnarValue::Array(Arc::new(array)))
+ }
+}
+
+#[tokio::test]
Review Comment:
Added the comment with a little more info.
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