izveigor commented on code in PR #7338:
URL: https://github.com/apache/arrow-datafusion/pull/7338#discussion_r1308283800
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datafusion/optimizer/src/analyzer/type_coercion.rs:
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@@ -553,6 +553,198 @@ fn coerce_arguments_for_signature(
.collect::<Result<Vec<_>>>()
}
+// TODO: Move this function to arrow-rs or common array utils module
+// base type is the non-list type
+fn base_type(data_type: &DataType) -> Result<DataType> {
Review Comment:
The function definitely has a practical use but it should be expanded for
all nested data types (list, fixed_list, map, union ...).
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