Dandandan commented on code in PR #12329:
URL: https://github.com/apache/datafusion/pull/12329#discussion_r1754591761
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datafusion/functions-nested/src/extract.rs:
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@@ -687,3 +695,115 @@ where
);
general_array_slice::<O>(array, &from_array, &to_array, None)
}
+
+#[derive(Debug)]
+pub(super) struct ArrayAnyValue {
+ signature: Signature,
+ aliases: Vec<String>,
+}
+
+impl ArrayAnyValue {
+ pub fn new() -> Self {
+ Self {
+ signature: Signature::array(Volatility::Immutable),
+ aliases: vec![String::from("list_any_value")],
+ }
+ }
+}
+
+impl ScalarUDFImpl for ArrayAnyValue {
+ fn as_any(&self) -> &dyn Any {
+ self
+ }
+ fn name(&self) -> &str {
+ "array_any_value"
+ }
+ fn signature(&self) -> &Signature {
+ &self.signature
+ }
+ fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
+ match &arg_types[0] {
+ List(field)
+ | LargeList(field)
+ | FixedSizeList(field, _) => Ok(field.data_type().clone()),
+ _ => plan_err!(
+ "array_any_value can only accept List, LargeList or
FixedSizeList as the argument"
+ ),
+ }
+ }
+
+ fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> {
+ make_scalar_function(array_any_value_inner)(args)
+ }
+ fn aliases(&self) -> &[String] {
+ &self.aliases
+ }
+}
+
+fn array_any_value_inner(args: &[ArrayRef]) -> Result<ArrayRef> {
+ if args.len() != 1 {
+ return exec_err!("array_any_value expects one argument");
+ }
+
+ match &args[0].data_type() {
+ List(_) => {
+ let array = as_list_array(&args[0])?;
+ general_array_any_value::<i32>(array)
+ }
+ LargeList(_) => {
+ let array = as_large_list_array(&args[0])?;
+ general_array_any_value::<i64>(array)
+ }
+ data_type => exec_err!("array_any_value does not support type: {:?}",
data_type),
+ }
+}
+
+fn general_array_any_value<O: OffsetSizeTrait>(
+ array: &GenericListArray<O>,
+) -> Result<ArrayRef>
+where
+ i64: TryInto<O>,
+{
+ let values = array.values();
+ let original_data = values.to_data();
+ let capacity = Capacities::Array(array.len());
+
+ let mut mutable =
+ MutableArrayData::with_capacities(vec![&original_data], true,
capacity);
+
+ for (row_index, offset_window) in array.offsets().windows(2).enumerate() {
+ let start = offset_window[0];
+ let end = offset_window[1];
+ let len = end - start;
+
+ // array is null
+ if len == O::usize_as(0) {
+ mutable.extend_nulls(1);
+ continue;
+ }
+
+ let row_value = array.value(row_index);
+ match row_value.nulls() {
+ Some(row_nulls_buffer) => {
+ // nulls are present in the array so try to take the first
valid element
+ if let Some(first_non_null_index) =
Review Comment:
I think based on `valid_indices` it should the first valid index, no?
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