Veeupup commented on code in PR #8333:
URL: https://github.com/apache/arrow-datafusion/pull/8333#discussion_r1409313857
##########
datafusion/expr/src/built_in_function.rs:
##########
@@ -536,7 +536,23 @@ impl BuiltinScalarFunction {
let data_type = get_base_type(&input_expr_types[0])?;
Ok(data_type)
}
- BuiltinScalarFunction::ArrayAppend =>
Ok(input_expr_types[0].clone()),
+ BuiltinScalarFunction::ArrayAppend => {
+ if let DataType::List(field) = input_expr_types[0].clone() {
+ if field.data_type().equals_datatype(&DataType::Null) {
+ Ok(DataType::List(Arc::new(Field::new(
+ "item",
+ input_expr_types[1].clone(),
+ true,
+ ))))
+ } else {
+ Ok(input_expr_types[0].clone())
+ }
+ } else {
+ plan_err!(
+ "The {self} function can only accept list as the first
argument"
Review Comment:
thanks! fixed.
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