diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLColumnDefinition.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLColumnDefinition.java
index 1cc5d456b3..d85dcfddde 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLColumnDefinition.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLColumnDefinition.java
@@ -15,29 +15,52 @@
  */
 package com.alibaba.druid.sql.ast.statement;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import com.alibaba.druid.sql.ast.SQLDataType;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-import java.util.ArrayList;
-import java.util.List;
-
 public class SQLColumnDefinition extends SQLObjectImpl implements SQLTableElement {
 
     protected SQLName                         name;
     protected SQLDataType                     dataType;
     protected SQLExpr                         defaultExpr;
-    protected final List<SQLColumnConstraint> constraints = new ArrayList<SQLColumnConstraint>(0);
-    protected SQLExpr                          comment;
+    protected final List<SQLColumnConstraint> constraints   = new ArrayList<SQLColumnConstraint>(0);
+    protected SQLExpr                         comment;
 
     protected Boolean                         enable;
 
+    // for mysql
+    protected boolean                         autoIncrement = false;
+    protected SQLExpr                         onUpdate;
+    protected SQLExpr                         storage;
+    protected SQLExpr                         charsetExpr;
+    protected SQLExpr                         asExpr;
+    protected boolean                         sorted        = false;
+    protected boolean                         virtual       = false;
+
+    protected Identity                        identity;
+
     public SQLColumnDefinition(){
 
     }
 
+    public Identity getIdentity() {
+        return identity;
+    }
+
+    // for sqlserver
+    public void setIdentity(Identity identity) {
+        if (identity != null) {
+            identity.setParent(this);
+        }
+        this.identity = identity;
+    }
+
     public Boolean getEnable() {
         return enable;
     }
@@ -107,4 +130,108 @@ public class SQLColumnDefinition extends SQLObjectImpl implements SQLTableElemen
         this.comment = comment;
     }
 
+    public boolean isVirtual() {
+        return virtual;
+    }
+
+    public void setVirtual(boolean virtual) {
+        this.virtual = virtual;
+    }
+
+    public boolean isSorted() {
+        return sorted;
+    }
+
+    public void setSorted(boolean sorted) {
+        this.sorted = sorted;
+    }
+
+    public SQLExpr getCharsetExpr() {
+        return charsetExpr;
+    }
+
+    public void setCharsetExpr(SQLExpr charsetExpr) {
+        if (charsetExpr != null) {
+            charsetExpr.setParent(this);
+        }
+        this.charsetExpr = charsetExpr;
+    }
+
+    public SQLExpr getAsExpr() {
+        return asExpr;
+    }
+
+    public void setAsExpr(SQLExpr asExpr) {
+        if (charsetExpr != null) {
+            charsetExpr.setParent(this);
+        }
+        this.asExpr = asExpr;
+    }
+
+    public boolean isAutoIncrement() {
+        return autoIncrement;
+    }
+
+    public void setAutoIncrement(boolean autoIncrement) {
+        this.autoIncrement = autoIncrement;
+    }
+
+    public SQLExpr getOnUpdate() {
+        return onUpdate;
+    }
+
+    public void setOnUpdate(SQLExpr onUpdate) {
+        this.onUpdate = onUpdate;
+    }
+
+    public SQLExpr getStorage() {
+        return storage;
+    }
+
+    public void setStorage(SQLExpr storage) {
+        this.storage = storage;
+    }
+
+    public static class Identity extends SQLObjectImpl {
+
+        private Integer seed;
+        private Integer increment;
+
+        private boolean notForReplication;
+
+        public Identity(){
+
+        }
+
+        public Integer getSeed() {
+            return seed;
+        }
+
+        public void setSeed(Integer seed) {
+            this.seed = seed;
+        }
+
+        public Integer getIncrement() {
+            return increment;
+        }
+
+        public void setIncrement(Integer increment) {
+            this.increment = increment;
+        }
+
+        public boolean isNotForReplication() {
+            return notForReplication;
+        }
+
+        public void setNotForReplication(boolean notForReplication) {
+            this.notForReplication = notForReplication;
+        }
+
+        @Override
+        public void accept0(SQLASTVisitor visitor) {
+            visitor.visit(this);
+            visitor.endVisit(this);
+        }
+
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSQLColumnDefinition.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSQLColumnDefinition.java
deleted file mode 100644
index 74b03b0518..0000000000
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSQLColumnDefinition.java
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright 1999-2101 Alibaba Group Holding Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.alibaba.druid.sql.dialect.mysql.ast.statement;
-
-import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
-
-public class MySqlSQLColumnDefinition extends SQLColumnDefinition {
-
-    private boolean autoIncrement = false;
-
-    private SQLExpr onUpdate;
-
-    private SQLExpr storage;
-
-    private SQLExpr charsetExpr;
-
-
-    public MySqlSQLColumnDefinition(){
-
-    }
-
-    public SQLExpr getCharsetExpr() {
-        return charsetExpr;
-    }
-
-    public void setCharsetExpr(SQLExpr charsetExpr) {
-        this.charsetExpr = charsetExpr;
-    }
-
-    public boolean isAutoIncrement() {
-        return autoIncrement;
-    }
-
-    public void setAutoIncrement(boolean autoIncrement) {
-        this.autoIncrement = autoIncrement;
-    }
-
-    public SQLExpr getOnUpdate() {
-        return onUpdate;
-    }
-
-    public void setOnUpdate(SQLExpr onUpdate) {
-        this.onUpdate = onUpdate;
-    }
-
-    public SQLExpr getStorage() {
-        return storage;
-    }
-
-    public void setStorage(SQLExpr storage) {
-        this.storage = storage;
-    }
-}
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlExprParser.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlExprParser.java
index 06f8db560c..9d73826a26 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlExprParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlExprParser.java
@@ -20,8 +20,8 @@ import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLOrderBy;
 import com.alibaba.druid.sql.ast.SQLOrderingSpecification;
-import com.alibaba.druid.sql.ast.expr.SQLBinaryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
@@ -45,11 +45,10 @@ import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlExtractExpr;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlIntervalExpr;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlIntervalUnit;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlMatchAgainstExpr;
-import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlOrderingExpr;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlMatchAgainstExpr.SearchModifier;
+import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlOrderingExpr;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlOutFileExpr;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlUserName;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSQLColumnDefinition;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
 import com.alibaba.druid.sql.parser.Lexer;
@@ -517,7 +516,7 @@ public class MySqlExprParser extends SQLExprParser {
     }
 
     public SQLColumnDefinition parseColumn() {
-        MySqlSQLColumnDefinition column = new MySqlSQLColumnDefinition();
+        SQLColumnDefinition column = new SQLColumnDefinition();
         column.setName(name());
         column.setDataType(parseDataType());
 
@@ -529,7 +528,7 @@ public class MySqlExprParser extends SQLExprParser {
             lexer.nextToken();
             accept(Token.UPDATE);
             SQLExpr expr = this.expr();
-            ((MySqlSQLColumnDefinition) column).setOnUpdate(expr);
+            column.setOnUpdate(expr);
         }
         if (identifierEquals("CHARSET")) {
             lexer.nextToken();
@@ -541,14 +540,12 @@ public class MySqlExprParser extends SQLExprParser {
                 charSetCollateExpr.setCollate(lexer.stringVal());
                 lexer.nextToken();
             }
-            ((MySqlSQLColumnDefinition) column).setCharsetExpr(charSetCollateExpr);
+            column.setCharsetExpr(charSetCollateExpr);
             return parseColumnRest(column);
         }
         if (identifierEquals("AUTO_INCREMENT")) {
             lexer.nextToken();
-            if (column instanceof MySqlSQLColumnDefinition) {
-                ((MySqlSQLColumnDefinition) column).setAutoIncrement(true);
-            }
+            column.setAutoIncrement(true);
             return parseColumnRest(column);
         }
 
@@ -563,9 +560,25 @@ public class MySqlExprParser extends SQLExprParser {
         if (identifierEquals("STORAGE")) {
             lexer.nextToken();
             SQLExpr expr = expr();
-            if (column instanceof MySqlSQLColumnDefinition) {
-                ((MySqlSQLColumnDefinition) column).setStorage(expr);
-            }
+            column.setStorage(expr);
+        }
+        
+        if (lexer.token() == Token.AS) {
+            lexer.nextToken();
+            accept(Token.LPAREN);
+            SQLExpr expr = expr();
+            column.setAsExpr(expr);
+            accept(Token.RPAREN);
+        }
+        
+        if (identifierEquals("STORED")) {
+            lexer.nextToken();
+            column.setSorted(true);
+        }
+        
+        if (identifierEquals("VIRTUAL")) {
+            lexer.nextToken();
+            column.setVirtual(true);
         }
 
         super.parseColumnRest(column);
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
index c952f67b05..53f5ca6a2b 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
@@ -103,7 +103,6 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlRenameTableStateme
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlReplaceStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlResetStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlRollbackStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSQLColumnDefinition;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetCharSetStatement;
@@ -295,19 +294,13 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
     }
 
     public boolean visit(SQLColumnDefinition x) {
-        MySqlSQLColumnDefinition mysqlColumn = null;
-
-        if (x instanceof MySqlSQLColumnDefinition) {
-            mysqlColumn = (MySqlSQLColumnDefinition) x;
-        }
-
         x.getName().accept(this);
         print(' ');
         x.getDataType().accept(this);
 
-        if (mysqlColumn != null && mysqlColumn.getCharsetExpr() != null) {
+        if (x.getCharsetExpr() != null) {
             print0(ucase ? " CHARSET " : " charset ");
-            mysqlColumn.getCharsetExpr().accept(this);
+            x.getCharsetExpr().accept(this);
         }
 
         for (SQLColumnConstraint item : x.getConstraints()) {
@@ -324,18 +317,18 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
             }
         }
 
-        if (mysqlColumn != null && mysqlColumn.getStorage() != null) {
+        if (x.getStorage() != null) {
             print0(ucase ? " STORAGE " : " storage ");
-            mysqlColumn.getStorage().accept(this);
+            x.getStorage().accept(this);
         }
 
-        if (mysqlColumn != null && mysqlColumn.getOnUpdate() != null) {
+        if (x.getOnUpdate() != null) {
             print0(ucase ? " ON UPDATE " : " on update ");
 
-            mysqlColumn.getOnUpdate().accept(this);
+            x.getOnUpdate().accept(this);
         }
 
-        if (mysqlColumn != null && mysqlColumn.isAutoIncrement()) {
+        if (x.isAutoIncrement()) {
             print0(ucase ? " AUTO_INCREMENT" : " auto_increment");
         }
 
@@ -343,6 +336,16 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
             print0(ucase ? " COMMENT " : " comment ");
             x.getComment().accept(this);
         }
+        
+        if (x.getAsExpr() != null) {
+            print0(ucase ? " AS (" : " as (");
+            x.getAsExpr().accept(this);
+            print(')');
+        }
+        
+        if (x.isSorted()) {
+            print0(ucase ? " SORTED" : " sorted"); 
+        }
 
         return false;
     }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/ast/SQLServerColumnDefinition.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/ast/SQLServerColumnDefinition.java
deleted file mode 100644
index 6ff10884f9..0000000000
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/ast/SQLServerColumnDefinition.java
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * Copyright 1999-2101 Alibaba Group Holding Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.alibaba.druid.sql.dialect.sqlserver.ast;
-
-import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
-import com.alibaba.druid.sql.dialect.sqlserver.visitor.SQLServerASTVisitor;
-import com.alibaba.druid.sql.visitor.SQLASTVisitor;
-
-public class SQLServerColumnDefinition extends SQLColumnDefinition implements SQLServerObject {
-
-    private Identity identity;
-
-    public SQLServerColumnDefinition(){
-
-    }
-
-    public Identity getIdentity() {
-        return identity;
-    }
-
-    public void setIdentity(Identity identity) {
-        if (identity != null) {
-            identity.setParent(this);
-        }
-        this.identity = identity;
-    }
-
-    @Override
-    protected void accept0(SQLASTVisitor visitor) {
-        this.accept0((SQLServerASTVisitor) visitor);
-    }
-
-    @Override
-    public void accept0(SQLServerASTVisitor visitor) {
-        if (visitor.visit(this)) {
-            this.acceptChild(visitor, name);
-            this.acceptChild(visitor, dataType);
-            this.acceptChild(visitor, defaultExpr);
-            this.acceptChild(visitor, constraints);
-            this.acceptChild(visitor, identity);
-        }
-        visitor.endVisit(this);
-    }
-
-    public static class Identity extends SQLServerObjectImpl {
-
-        private Integer seed;
-        private Integer increment;
-
-        private boolean notForReplication;
-
-        public Identity(){
-
-        }
-
-        public Integer getSeed() {
-            return seed;
-        }
-
-        public void setSeed(Integer seed) {
-            this.seed = seed;
-        }
-
-        public Integer getIncrement() {
-            return increment;
-        }
-
-        public void setIncrement(Integer increment) {
-            this.increment = increment;
-        }
-
-        public boolean isNotForReplication() {
-            return notForReplication;
-        }
-
-        public void setNotForReplication(boolean notForReplication) {
-            this.notForReplication = notForReplication;
-        }
-
-        @Override
-        public void accept0(SQLServerASTVisitor visitor) {
-            visitor.visit(this);
-            visitor.endVisit(this);
-        }
-
-    }
-}
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerExprParser.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerExprParser.java
index 505bd58fd3..11e34336aa 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerExprParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerExprParser.java
@@ -26,7 +26,6 @@ import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
-import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerColumnDefinition;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerOutput;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerTop;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.expr.SQLServerObjectReferenceExpr;
@@ -192,7 +191,7 @@ public class SQLServerExprParser extends SQLExprParser {
     }
 
     public SQLColumnDefinition createColumnDefinition() {
-        SQLColumnDefinition column = new SQLServerColumnDefinition();
+        SQLColumnDefinition column = new SQLColumnDefinition();
         return column;
     }
 
@@ -206,7 +205,7 @@ public class SQLServerExprParser extends SQLExprParser {
             SQLIntegerExpr increment = (SQLIntegerExpr) this.primary();
             accept(Token.RPAREN);
 
-            SQLServerColumnDefinition.Identity identity = new SQLServerColumnDefinition.Identity();
+            SQLColumnDefinition.Identity identity = new SQLColumnDefinition.Identity();
             identity.setSeed((Integer) seed.getNumber());
             identity.setIncrement((Integer) increment.getNumber());
 
@@ -223,8 +222,7 @@ public class SQLServerExprParser extends SQLExprParser {
                 }
             }
 
-            SQLServerColumnDefinition sqlSreverColumn = (SQLServerColumnDefinition) column;
-            sqlSreverColumn.setIdentity(identity);
+            column.setIdentity(identity);
         }
 
         return super.parseColumnRest(column);
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitor.java
index eca77bd87a..5772b89671 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitor.java
@@ -15,7 +15,6 @@
  */
 package com.alibaba.druid.sql.dialect.sqlserver.visitor;
 
-import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerColumnDefinition;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerOutput;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelect;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock;
@@ -55,14 +54,6 @@ public interface SQLServerASTVisitor extends SQLASTVisitor {
     
     void endVisit(SQLServerUpdateStatement x);
     
-    boolean visit(SQLServerColumnDefinition x);
-    
-    void endVisit(SQLServerColumnDefinition x);
-    
-    boolean visit(SQLServerColumnDefinition.Identity x);
-    
-    void endVisit(SQLServerColumnDefinition.Identity x);
-    
     boolean visit(SQLServerExecStatement x);
     
     void endVisit(SQLServerExecStatement x);
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitorAdapter.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitorAdapter.java
index 4d24ffe090..6e98b56a88 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitorAdapter.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerASTVisitorAdapter.java
@@ -15,7 +15,6 @@
  */
 package com.alibaba.druid.sql.dialect.sqlserver.visitor;
 
-import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerColumnDefinition;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerOutput;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelect;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock;
@@ -85,26 +84,6 @@ public class SQLServerASTVisitorAdapter extends SQLASTVisitorAdapter implements
 
     }
 
-    @Override
-    public boolean visit(SQLServerColumnDefinition.Identity x) {
-        return true;
-    }
-
-    @Override
-    public void endVisit(SQLServerColumnDefinition.Identity x) {
-
-    }
-
-    @Override
-    public boolean visit(SQLServerColumnDefinition x) {
-        return true;
-    }
-
-    @Override
-    public void endVisit(SQLServerColumnDefinition x) {
-
-    }
-
     @Override
     public boolean visit(SQLServerExecStatement x) {
         return true;
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerOutputVisitor.java
index 5a08027a6d..449f19dae3 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerOutputVisitor.java
@@ -24,8 +24,6 @@ import com.alibaba.druid.sql.ast.statement.SQLColumnConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLGrantStatement;
-import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerColumnDefinition;
-import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerColumnDefinition.Identity;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerOutput;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelect;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock;
@@ -275,22 +273,7 @@ public class SQLServerOutputVisitor extends SQLASTOutputVisitor implements SQLSe
     }
 
     @Override
-    public boolean visit(Identity x) {
-        print0(ucase ? "IDENTITY (" : "identity (");
-        print(x.getSeed());
-        print0(", ");
-        print(x.getIncrement());
-        print(')');
-        return false;
-    }
-
-    @Override
-    public void endVisit(Identity x) {
-
-    }
-
-    @Override
-    public boolean visit(SQLServerColumnDefinition x) {
+    public boolean visit(SQLColumnDefinition x) {
         x.getName().accept(this);
 
         if (x.getDataType() != null) {
@@ -321,18 +304,6 @@ public class SQLServerOutputVisitor extends SQLASTOutputVisitor implements SQLSe
         return false;
     }
 
-    @Override
-    public void endVisit(SQLServerColumnDefinition x) {
-
-    }
-
-    public boolean visit(SQLColumnDefinition x) {
-        if (x instanceof SQLServerColumnDefinition) {
-            return visit((SQLServerColumnDefinition) x);
-        }
-        return super.visit(x);
-    }
-
     @Override
     public boolean visit(SQLServerExecStatement x) {
         print0(ucase ? "EXEC " : "exec ");
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerSchemaStatVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerSchemaStatVisitor.java
index e51b0a010e..50f88d5d57 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerSchemaStatVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerSchemaStatVisitor.java
@@ -19,11 +19,8 @@ import java.util.Map;
 
 import com.alibaba.druid.sql.ast.SQLDeclareItem;
 import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
-import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerColumnDefinition;
-import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerColumnDefinition.Identity;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerOutput;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelect;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock;
@@ -116,26 +113,6 @@ public class SQLServerSchemaStatVisitor extends SchemaStatVisitor implements SQL
 
     }
 
-    @Override
-    public boolean visit(Identity x) {
-        return false;
-    }
-
-    @Override
-    public void endVisit(Identity x) {
-
-    }
-
-    @Override
-    public boolean visit(SQLServerColumnDefinition x) {
-        return visit((SQLColumnDefinition) x);
-    }
-
-    @Override
-    public void endVisit(SQLServerColumnDefinition x) {
-
-    }
-
     @Override
     public boolean visit(SQLServerExecStatement x) {
         return false;
diff --git a/src/main/java/com/alibaba/druid/sql/parser/SQLCreateTableParser.java b/src/main/java/com/alibaba/druid/sql/parser/SQLCreateTableParser.java
index 48bdc3cdd9..8578498a4b 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/SQLCreateTableParser.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/SQLCreateTableParser.java
@@ -16,7 +16,6 @@
 package com.alibaba.druid.sql.parser;
 
 import com.alibaba.druid.sql.ast.SQLName;
-import com.alibaba.druid.sql.ast.SQLPartition;
 import com.alibaba.druid.sql.ast.SQLPartitionValue;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
index fd9cd81469..b90a5c7015 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
@@ -1083,6 +1083,16 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Printab
         
         return false;
     }
+    
+    @Override
+    public boolean visit(SQLColumnDefinition.Identity x) {
+        print0(ucase ? "IDENTITY (" : "identity (");
+        print(x.getSeed());
+        print0(", ");
+        print(x.getIncrement());
+        print(')');
+        return false;
+    }
 
     protected void visitColumnDefault(SQLColumnDefinition x) {
         print0(ucase ? " DEFAULT " : " default ");
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
index d457186c52..aadb16a3e3 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
@@ -286,6 +286,10 @@ public interface SQLASTVisitor {
     boolean visit(SQLColumnDefinition x);
 
     void endVisit(SQLColumnDefinition x);
+    
+    boolean visit(SQLColumnDefinition.Identity x);
+    
+    void endVisit(SQLColumnDefinition.Identity x);
 
     boolean visit(SQLDataType x);
 
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java
index 9a67949170..f6c61e33a1 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java
@@ -372,6 +372,13 @@ public class SQLASTVisitorAdapter implements SQLASTVisitor {
 
     public void endVisit(SQLColumnDefinition x) {
     }
+    
+    public boolean visit(SQLColumnDefinition.Identity x) {
+        return true;
+    }
+    
+    public void endVisit(SQLColumnDefinition.Identity x) {
+    }
 
     public boolean visit(SQLDataType x) {
         return true;
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlCreateTableTest69.java b/src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlCreateTableTest69.java
new file mode 100644
index 0000000000..bd41e3ee9a
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlCreateTableTest69.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 1999-2101 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.mysql;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.alibaba.druid.sql.MysqlTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
+
+public class MySqlCreateTableTest69 extends MysqlTest {
+
+    @Test
+    public void test_one() throws Exception {
+        String sql = "CREATE TABLE t1 ("
+                + "  s1 INT,"
+                + "  s2 INT AS (EXP(s1)) STORED"
+                + ")"
+                + "PARTITION BY LIST (s2) ("
+                + "  PARTITION p1 VALUES IN (1)"
+                + ");";
+
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseCreateTable();
+
+        MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("CREATE TABLE t1 ("
+                + "\n\ts1 INT, "
+                + "\n\ts2 INT AS (EXP(s1)) SORTED"
+                + "\n)"
+                + "\nPARTITION BY LIST (s2)"
+                + "\n("
+                + "\n\tPARTITION p1 VALUES IN (1)"
+                + "\n)", output);
+
+    }
+}