jayzhan211 commented on code in PR #9233:
URL: https://github.com/apache/arrow-datafusion/pull/9233#discussion_r1492342440
##########
datafusion/expr/src/type_coercion/functions.rs:
##########
@@ -130,6 +130,31 @@ fn get_valid_types(
_ => Ok(vec![vec![]]),
}
}
+ fn array_append_and_optional_index(
+ current_types: &[DataType],
+ ) -> Result<Vec<Vec<DataType>>> {
+ // make sure there's at least 2 arguments
+ if !(current_types.len() == 2 || current_types.len() == 3) {
+ return Ok(vec![vec![]]);
+ }
+
+ let first_two_types = ¤t_types[0..2];
+ let valid_types = array_append_or_prepend_valid_types(first_two_types,
true)?;
+
+ let valid_types_with_index = valid_types
Review Comment:
I think we can optionally append valid_types_with_index if the len is 3,
otherwise just return here.
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