sdf-jkl commented on code in PR #19722:
URL: https://github.com/apache/datafusion/pull/19722#discussion_r2702607938
##########
datafusion/expr/src/udf.rs:
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@@ -696,6 +715,36 @@ pub trait ScalarUDFImpl: Debug + DynEq + DynHash + Send +
Sync {
Ok(ExprSimplifyResult::Original(args))
}
+ /// Returns the [preimage] for this function and the specified scalar
value, if any.
+ ///
+ /// A preimage is a single contiguous [`Interval`] of values where the
function
+ /// will always return `lit_value`
+ ///
+ /// This rewrite is described in the [ClickHouse Paper] and is particularly
Review Comment:
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