joroKr21 commented on code in PR #12922:
URL: https://github.com/apache/datafusion/pull/12922#discussion_r1802530293
##########
datafusion/expr-common/src/columnar_value.rs:
##########
@@ -218,6 +217,17 @@ impl ColumnarValue {
}
}
}
+
+ /// Converts an [`ArrayRef`] to a [`ColumnarValue`] based on the supplied
arguments.
+ /// This is useful for scalar UDF implementations to fulfil their contract:
+ /// if all arguments are scalar values, the result should also be a scalar
value.
+ pub fn from_args_and_result(args: &[Self], result: ArrayRef) ->
Result<Self> {
+ if result.len() == 1 && args.iter().all(|arg| matches!(arg,
Self::Scalar(_))) {
+ Ok(Self::Scalar(ScalarValue::try_from_array(&result, 0)?))
+ } else {
+ Ok(Self::Array(result))
Review Comment:
It's not the only place where it matters. If for some reason the expression
is not constant folded, you will get an error that the array lengths of
different columns don't match.
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