fix(schema): treat rowkind as special field

Author: zjw1111

src/paimon/common/table/special_fields.h

@@ -65,7 +65,8 @@ struct SpecialFields {
 
     static bool IsSpecialFieldName(const std::string& field_name) {
         if (field_name == SequenceNumber().Name() || field_name == ValueKind().Name() ||
-            field_name == RowId().Name() || field_name == IndexScore().Name()) {
+            field_name == RowKind().Name() || field_name == RowId().Name() ||
+            field_name == IndexScore().Name()) {
             return true;
         }
         return false;

src/paimon/common/table/special_fields_test.cpp

@@ -61,6 +61,7 @@ TEST(SpecialFieldsTest, TestIsSpecialFieldName) {
     ASSERT_TRUE(SpecialFields::IsSpecialFieldName("_SEQUENCE_NUMBER"));
     ASSERT_TRUE(SpecialFields::IsSpecialFieldName("_VALUE_KIND"));
     ASSERT_FALSE(SpecialFields::IsSpecialFieldName("VALUE_KIND"));
+    ASSERT_TRUE(SpecialFields::IsSpecialFieldName("rowkind"));
     ASSERT_TRUE(SpecialFields::IsSpecialFieldName("_ROW_ID"));
     ASSERT_TRUE(SpecialFields::IsSpecialFieldName("_INDEX_SCORE"));
 }