dharanad commented on code in PR #11796:
URL: https://github.com/apache/datafusion/pull/11796#discussion_r1705053100
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datafusion/expr/src/type_coercion/binary.rs:
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@@ -890,15 +890,22 @@ fn dictionary_coercion(
/// 2. Data type of the other side should be able to cast to string type
fn string_concat_coercion(lhs_type: &DataType, rhs_type: &DataType) ->
Option<DataType> {
use arrow::datatypes::DataType::*;
- string_coercion(lhs_type, rhs_type).or(match (lhs_type, rhs_type) {
- (Utf8, from_type) | (from_type, Utf8) => {
- string_concat_internal_coercion(from_type, &Utf8)
- }
- (LargeUtf8, from_type) | (from_type, LargeUtf8) => {
- string_concat_internal_coercion(from_type, &LargeUtf8)
+ match (lhs_type, rhs_type) {
+ // If Utf8View is in any side, we coerce to Utf8.
Review Comment:
> I think it would be better to coerce to `Utf8View` as that coercsion will
often be faster (it is faster to cast Utf8 -> Utf8View than the other way
around)
>
> Is that possible?
How about we do in a seperate PR. Previously, we were coerced to
`Utf8View`, so concat was failing. As a temporary workaround to resolve the
issue, I've coerce Utf8 instead.
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