diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java
index bc26cc04..a4f15c96 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java
@@ -21,6 +21,12 @@ import com.mybatisflex.core.util.StringUtil;
 
 import java.util.List;
 
+/**
+ * 子查询列。
+ *
+ * @author michael
+ * @author 王帅
+ */
 public class SelectQueryColumn extends QueryColumn implements HasParamsColumn {
 
     private QueryWrapper queryWrapper;
@@ -29,11 +35,15 @@ public class SelectQueryColumn extends QueryColumn implements HasParamsColumn {
         this.queryWrapper = queryWrapper;
     }
 
-
-    QueryWrapper getQueryWrapper() {
+    public QueryWrapper getQueryWrapper() {
         return queryWrapper;
     }
 
+    @Override
+    String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
+        return dialect.forSelectByQuery(queryWrapper);
+    }
+
     @Override
     String toSelectSql(List<QueryTable> queryTables, IDialect dialect) {
         String selectSql = dialect.forSelectByQuery(queryWrapper);
@@ -51,11 +61,6 @@ public class SelectQueryColumn extends QueryColumn implements HasParamsColumn {
         return clone;
     }
 
-    @Override
-    String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
-        return dialect.forSelectByQuery(queryWrapper);
-    }
-
     @Override
     public Object[] getParamValues() {
         return queryWrapper.getAllValueArray();