ozankabak commented on code in PR #13841:
URL: https://github.com/apache/datafusion/pull/13841#discussion_r1892004788
##########
datafusion/expr/src/udf.rs:
##########
@@ -652,8 +659,29 @@ pub trait ScalarUDFImpl: Debug + Send + Sync {
/// Calculates the [`SortProperties`] of this function based on its
/// children's properties.
- fn output_ordering(&self, _inputs: &[ExprProperties]) ->
Result<SortProperties> {
- Ok(SortProperties::Unordered)
+ fn output_ordering(&self, inputs: &[ExprProperties]) ->
Result<SortProperties> {
+ if !self.output_preserves_lex_ordering(inputs)? {
+ return Ok(SortProperties::Unordered);
+ }
+
+ let Some(first_order) = inputs.first().map(|p| &p.sort_properties)
else {
+ return Ok(SortProperties::Unordered);
+ };
+
+ if inputs
+ .iter()
+ .skip(1)
+ .all(|input| &input.sort_properties == first_order)
+ {
+ Ok(*first_order)
+ } else {
+ Ok(SortProperties::Unordered)
+ }
+ }
+
+ /// Whether the function preserves lexicographical ordering based on the
input ordering
+ fn output_preserves_lex_ordering(&self, _inputs: &[ExprProperties]) ->
Result<bool> {
Review Comment:
Seems like you don't need the `output_` prefix, just
`preserves_lex_ordering` is enough.
##########
datafusion/expr/src/udf.rs:
##########
@@ -809,6 +837,10 @@ impl ScalarUDFImpl for AliasedScalarUDFImpl {
self.inner.output_ordering(inputs)
}
+ fn output_preserves_lex_ordering(&self, inputs: &[ExprProperties]) ->
Result<bool> {
Review Comment:
Seems like you don't need the `output_` prefix, just
`preserves_lex_ordering` is enough.
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