diff --git a/src/main/java/com/github/yulichang/common/JoinLambdaWrapper.java b/src/main/java/com/github/yulichang/common/JoinLambdaWrapper.java
index 859f359..37bc421 100644
--- a/src/main/java/com/github/yulichang/common/JoinLambdaWrapper.java
+++ b/src/main/java/com/github/yulichang/common/JoinLambdaWrapper.java
@@ -98,7 +98,7 @@ public class JoinLambdaWrapper<T> extends JoinAbstractLambdaWrapper<T, JoinLambd
     /**
      * 不建议直接 new 该实例，使用 Wrappers.lambdaQuery(...)
      */
-    JoinLambdaWrapper(T entity, Class<T> entityClass, SharedString sqlSelect, AtomicInteger paramNameSeq,
+    JoinLambdaWrapper(T entity, Class<T> entityClass, AtomicInteger paramNameSeq,
                       Map<String, Object> paramNameValuePairs, MergeSegments mergeSegments,
                       SharedString lastSql, SharedString sqlComment, SharedString sqlFirst) {
         super.setEntity(entity);
@@ -112,14 +112,9 @@ public class JoinLambdaWrapper<T> extends JoinAbstractLambdaWrapper<T, JoinLambd
         this.sqlFirst = sqlFirst;
     }
 
-
-    /**
-     * 用于生成嵌套 sql
-     * <p>故 sqlSelect 不向下传递</p>
-     */
     @Override
     protected JoinLambdaWrapper<T> instance() {
-        return new JoinLambdaWrapper<>(getEntity(), getEntityClass(), null, paramNameSeq, paramNameValuePairs,
+        return new JoinLambdaWrapper<>(getEntity(), getEntityClass(), paramNameSeq, paramNameValuePairs,
                 new MergeSegments(), SharedString.emptyString(), SharedString.emptyString(), SharedString.emptyString());
     }
 
diff --git a/src/main/java/com/github/yulichang/query/MPJAbstractLambdaWrapper.java b/src/main/java/com/github/yulichang/query/MPJAbstractLambdaWrapper.java
deleted file mode 100644
index 72e2463..0000000
--- a/src/main/java/com/github/yulichang/query/MPJAbstractLambdaWrapper.java
+++ /dev/null
@@ -1,86 +0,0 @@
-package com.github.yulichang.query;
-
-import com.baomidou.mybatisplus.core.conditions.AbstractWrapper;
-import com.baomidou.mybatisplus.core.toolkit.Assert;
-import com.baomidou.mybatisplus.core.toolkit.LambdaUtils;
-import com.baomidou.mybatisplus.core.toolkit.StringPool;
-import com.baomidou.mybatisplus.core.toolkit.support.ColumnCache;
-import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
-import com.baomidou.mybatisplus.core.toolkit.support.SerializedLambda;
-import com.github.yulichang.toolkit.Constant;
-import org.apache.ibatis.reflection.property.PropertyNamer;
-
-import java.util.Arrays;
-import java.util.Map;
-
-import static java.util.stream.Collectors.joining;
-
-/**
- * copy {@link com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper}
- */
-@SuppressWarnings("serial")
-public abstract class MPJAbstractLambdaWrapper<T, Children extends MPJAbstractLambdaWrapper<T, Children>>
-        extends AbstractWrapper<T, SFunction<T, ?>, Children> {
-
-    private Map<String, ColumnCache> columnMap = null;
-    private boolean initColumnMap = false;
-
-    @SuppressWarnings("unchecked")
-    @Override
-    protected String columnsToString(SFunction<T, ?>... columns) {
-        return columnsToString(true, columns);
-    }
-
-    @SuppressWarnings("unchecked")
-    protected String columnsToString(boolean onlyColumn, SFunction<T, ?>... columns) {
-        return Arrays.stream(columns).map(i -> columnToString(i, onlyColumn)).collect(joining(StringPool.COMMA));
-    }
-
-    @Override
-    protected String columnToString(SFunction<T, ?> column) {
-        return columnToString(column, true);
-    }
-
-    protected String columnToString(SFunction<T, ?> column, boolean onlyColumn) {
-        return Constant.TABLE_ALIAS + StringPool.DOT + getColumn(LambdaUtils.resolve(column), onlyColumn);
-    }
-
-    /**
-     * 获取 SerializedLambda 对应的列信息，从 lambda 表达式中推测实体类
-     * <p>
-     * 如果获取不到列信息，那么本次条件组装将会失败
-     *
-     * @param lambda     lambda 表达式
-     * @param onlyColumn 如果是，结果: "name", 如果否： "name" as "name"
-     * @return 列
-     * @throws com.baomidou.mybatisplus.core.exceptions.MybatisPlusException 获取不到列信息时抛出异常
-     * @see SerializedLambda#getImplClass()
-     * @see SerializedLambda#getImplMethodName()
-     */
-    private String getColumn(SerializedLambda lambda, boolean onlyColumn) {
-        Class<?> aClass = lambda.getInstantiatedType();
-        tryInitCache(aClass);
-        String fieldName = PropertyNamer.methodToProperty(lambda.getImplMethodName());
-        ColumnCache columnCache = getColumnCache(fieldName, aClass);
-        return onlyColumn ? columnCache.getColumn() : columnCache.getColumnSelect();
-    }
-
-    private void tryInitCache(Class<?> lambdaClass) {
-        if (!initColumnMap) {
-            final Class<T> entityClass = getEntityClass();
-            if (entityClass != null) {
-                lambdaClass = entityClass;
-            }
-            columnMap = LambdaUtils.getColumnMap(lambdaClass);
-            initColumnMap = true;
-        }
-        Assert.notNull(columnMap, "can not find lambda cache for this entity [%s]", lambdaClass.getName());
-    }
-
-    private ColumnCache getColumnCache(String fieldName, Class<?> lambdaClass) {
-        ColumnCache columnCache = columnMap.get(LambdaUtils.formatKey(fieldName));
-        Assert.notNull(columnCache, "can not find lambda cache for this property [%s] of entity [%s]",
-                fieldName, lambdaClass.getName());
-        return columnCache;
-    }
-}
diff --git a/src/main/java/com/github/yulichang/query/MPJLambdaQueryWrapper.java b/src/main/java/com/github/yulichang/query/MPJLambdaQueryWrapper.java
index c4da7ac..e89193a 100644
--- a/src/main/java/com/github/yulichang/query/MPJLambdaQueryWrapper.java
+++ b/src/main/java/com/github/yulichang/query/MPJLambdaQueryWrapper.java
@@ -1,5 +1,6 @@
 package com.github.yulichang.query;
 
+import com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper;
 import com.baomidou.mybatisplus.core.conditions.SharedString;
 import com.baomidou.mybatisplus.core.conditions.query.Query;
 import com.baomidou.mybatisplus.core.conditions.segments.MergeSegments;
@@ -28,7 +29,7 @@ import java.util.stream.Collectors;
  * sqlSelect 由覆盖改为追加
  */
 @SuppressWarnings("all")
-public class MPJLambdaQueryWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaQueryWrapper<T>>
+public class MPJLambdaQueryWrapper<T> extends AbstractLambdaWrapper<T, MPJLambdaQueryWrapper<T>>
         implements Query<MPJLambdaQueryWrapper<T>, T, SFunction<T, ?>>, MPJJoin<MPJLambdaQueryWrapper<T>> {
 
     /**
@@ -112,6 +113,11 @@ public class MPJLambdaQueryWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLam
         return typedThis;
     }
 
+    @Override
+    protected String columnToString(SFunction<T, ?> column, boolean onlyColumn) {
+        return Constant.TABLE_ALIAS + StringPool.DOT + super.columnToString(column, onlyColumn);
+    }
+
     @SafeVarargs
     public final MPJLambdaQueryWrapper<T> select(String... columns) {
         return select(true, columns);