jayzhan211 commented on code in PR #14268:
URL: https://github.com/apache/datafusion/pull/14268#discussion_r1942530489
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datafusion/expr/src/type_coercion/functions.rs:
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@@ -584,23 +541,36 @@ fn get_valid_types(
match target_type_class {
TypeSignatureClass::Native(native_type) => {
let target_type = native_type.native();
- if &logical_type == target_type {
- return target_type.default_cast_for(current_type);
+ if &logical_type == target_type
+ || logical_type == NativeType::Null
Review Comment:
This should be `target_type.default_cast_for(current_type)` only
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