joroKr21 commented on code in PR #10790:
URL: https://github.com/apache/datafusion/pull/10790#discussion_r1987015574
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datafusion/functions-array/src/set_ops.rs:
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@@ -259,6 +259,17 @@ fn generic_set_lists<OffsetSize: OffsetSizeTrait>(
return general_array_distinct::<OffsetSize>(l, &field);
}
+ // Handle empty array at rhs case
+ // array_union(arr, []) -> arr;
+ // array_intersect(arr, []) -> [];
+ if r.value_length(0).is_zero() {
+ if set_op == SetOp::Union {
+ return Ok(Arc::new(l.clone()) as ArrayRef);
+ } else {
+ return Ok(Arc::new(r.clone()) as ArrayRef);
+ }
+ }
Review Comment:
This will panic when `r` is empty and return wrong results when the first
value in the `r` array is an empty list but the rest are not empty.
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