yinzhijian commented on code in PR #9856:
URL: https://github.com/apache/incubator-doris/pull/9856#discussion_r890158272
##########
be/src/vec/functions/function_cast.h:
##########
@@ -1040,6 +1073,69 @@ class FunctionCast final : public IFunctionBase {
};
}
+ WrapperType create_array_wrapper(const DataTypePtr& from_type_untyped,
+ const DataTypeArray& to_type) const {
+ /// Conversion from String through parsing.
+ if (check_and_get_data_type<DataTypeString>(from_type_untyped.get())) {
+ return &ConvertImplGenericFromString<ColumnString>::execute;
+ }
+
+ const auto* from_type =
check_and_get_data_type<DataTypeArray>(from_type_untyped.get());
+
+ if (!from_type) {
+ LOG(FATAL) << "CAST AS Array can only be performed between
same-dimensional Array, "
+ "String types";
+ }
+
+ DataTypePtr from_nested_type = from_type->get_nested_type();
+
+ /// In query SELECT CAST([] AS Array(Array(String))) from type is
Array(Nothing)
Review Comment:
handle nulls with existing cast logic, same as _string_ cast to _int_.
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