jayzhan211 commented on code in PR #7008:
URL: https://github.com/apache/arrow-datafusion/pull/7008#discussion_r1268028734
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datafusion/expr/src/built_in_function.rs:
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@@ -464,12 +479,16 @@ impl BuiltinScalarFunction {
},
BuiltinScalarFunction::ArrayConcat => {
let mut expr_type = Null;
+ let mut max_dims = 1;
for input_expr_type in input_expr_types {
match input_expr_type {
List(field) => {
if !field.data_type().equals_datatype(&Null) {
Review Comment:
Is it possible to get a nested list array with a null type? i.e.
List(List(Null))
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