feichai0017 commented on code in PR #20945:
URL: https://github.com/apache/datafusion/pull/20945#discussion_r3346504019
##########
datafusion/expr/src/type_coercion/functions.rs:
##########
@@ -586,6 +586,50 @@ fn get_valid_types(
arguments: &[ArrayFunctionArgument],
array_coercion: Option<&ListCoercion>,
) -> Result<Vec<Vec<DataType>>> {
+ fn rebuild_array_type(
Review Comment:
Done in 06800baed: added a brief comment explaining that we preserve the
original list field to avoid unnecessary casts caused by field name / metadata
differences.
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