alamb commented on code in PR #12490:
URL: https://github.com/apache/datafusion/pull/12490#discussion_r1769137425
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datafusion/expr-common/src/type_coercion/binary.rs:
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@@ -1021,6 +1021,22 @@ fn list_coercion(lhs_type: &DataType, rhs_type:
&DataType) -> Option<DataType> {
use arrow::datatypes::DataType::*;
match (lhs_type, rhs_type) {
(List(_), List(_)) => Some(lhs_type.clone()),
+ (LargeList(_), List(_)) => Some(lhs_type.clone()),
+ (List(_), LargeList(_)) => Some(rhs_type.clone()),
+ (LargeList(_), LargeList(_)) => Some(lhs_type.clone()),
+ (List(_), FixedSizeList(_, _)) => Some(lhs_type.clone()),
+ (FixedSizeList(_, _), List(_)) => Some(rhs_type.clone()),
+ // Coerce to the left side FixedSizeList type if the list lengths are
the same,
+ // otherwise coerce to list with the left type for dynamic length
+ (FixedSizeList(lf, ls), FixedSizeList(_, rs)) => {
+ if ls == rs {
+ Some(lhs_type.clone())
+ } else {
+ Some(List(Arc::clone(lf)))
+ }
+ }
Review Comment:
That makes sense to me - the alternative is to just reject the query -- I
think this is reasonable
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