liaoxin01 commented on code in PR #9582:
URL: https://github.com/apache/incubator-doris/pull/9582#discussion_r877688404


##########
be/src/vec/sink/mysql_result_writer.cpp:
##########
@@ -419,9 +447,13 @@ Status VMysqlResultWriter::append_block(Block& 
input_block) {
         }
         case TYPE_DECIMALV2: {
             if (type_ptr->is_nullable()) {
-                status = _add_one_column<PrimitiveType::TYPE_DECIMALV2, 
true>(column_ptr, result);
+                auto& nested_type =
+                        assert_cast<const 
DataTypeNullable&>(*type_ptr).get_nested_type();
+                status = _add_one_column<PrimitiveType::TYPE_DECIMALV2, 
true>(column_ptr, result,

Review Comment:
   used for _add_one_column function to infer the type of decimal column.



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