agscpp commented on code in PR #13001:
URL: https://github.com/apache/datafusion/pull/13001#discussion_r1810525892
##########
datafusion/core/tests/user_defined/user_defined_scalar_functions.rs:
##########
@@ -483,6 +485,196 @@ async fn test_user_defined_functions_with_alias() ->
Result<()> {
Ok(())
}
+/// Volatile UDF that should be append a different value to each row
+struct AddIndexToStringScalarUDF {
+ name: String,
+ signature: Signature,
+ return_type: DataType,
+}
+
+impl AddIndexToStringScalarUDF {
+ fn new() -> Self {
+ Self {
+ name: "add_index_to_string".to_string(),
+ signature: Signature::exact(vec![DataType::Utf8],
Volatility::Volatile),
+ return_type: DataType::Utf8,
+ }
+ }
+}
+
+impl std::fmt::Debug for AddIndexToStringScalarUDF {
+ fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+ f.debug_struct("ScalarUDF")
+ .field("name", &self.name)
+ .field("signature", &self.signature)
+ .field("fun", &"<FUNC>")
+ .finish()
+ }
+}
+
+impl ScalarUDFImpl for AddIndexToStringScalarUDF {
+ fn as_any(&self) -> &dyn Any {
+ self
+ }
+
+ fn name(&self) -> &str {
+ &self.name
+ }
+
+ fn signature(&self) -> &Signature {
+ &self.signature
+ }
+
+ fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
+ Ok(self.return_type.clone())
+ }
+
+ fn invoke(&self, _args: &[ColumnarValue]) -> Result<ColumnarValue> {
+ not_impl_err!("index_with_offset function does not accept arguments")
+ }
+
+ fn invoke_batch(
+ &self,
+ _args: &[ColumnarValue],
+ _number_rows: usize,
+ ) -> Result<ColumnarValue> {
+ let answer = match &_args[0] {
+ // When called with static arguments, the result is returned as an
array.
+ ColumnarValue::Scalar(ScalarValue::Utf8(Some(value))) => {
+ let mut answer = vec![];
+ for index in 1..=_number_rows {
+ // When calling a function with immutable arguments, the
result is returned with ")".
+ // Example: SELECT add_index_to_string('const_value') FROM
table;
+ answer.push(index.to_string() + ") " + value);
+ }
+ answer
+ }
+ // The result is returned as an array when called with dynamic
arguments.
+ ColumnarValue::Array(array) => {
+ let string_array = as_string_array(array);
+ let mut counter = HashMap::<&str, u64>::new();
+ string_array
+ .iter()
+ .map(|value| {
+ let value = value.expect("Unexpected null");
+ let index = counter.get(value).unwrap_or(&0) + 1;
+ counter.insert(value, index);
+
+ // When calling a function with mutable arguments, the
result is returned with ".".
+ // Example: SELECT add_index_to_string(table.value)
FROM table;
+ index.to_string() + ". " + value
+ })
+ .collect()
+ }
+ _ => unimplemented!(),
+ };
+ Ok(ColumnarValue::Array(
Review Comment:
I removed this comment. This function is always called in the current
implementation.
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