refactor sql parser.

src/main/java/com/alibaba/druid/sql/PagerUtils.java

@@ -41,7 +41,7 @@ import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLUnionQuery;
 import com.alibaba.druid.sql.dialect.db2.ast.stmt.DB2SelectQueryBlock;
 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.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.odps.ast.OdpsSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectQueryBlock;
@@ -320,7 +320,7 @@ public class PagerUtils {
             throw new IllegalArgumentException("limit already exists.");
         }
 
-        Limit limit = new Limit();
+        SQLLimit limit = new SQLLimit();
         if (offset > 0) {
             limit.setOffset(new SQLNumberExpr(offset));
         }
@@ -470,7 +470,7 @@ public class PagerUtils {
             SQLSelectQuery query = selectStmt.getSelect().getQuery();
             if (query instanceof SQLSelectQueryBlock) {
                 if (query instanceof MySqlSelectQueryBlock) {
-                    MySqlSelectQueryBlock.Limit limit = ((MySqlSelectQueryBlock) query).getLimit();
+                    SQLLimit limit = ((MySqlSelectQueryBlock) query).getLimit();
 
                     if (limit == null) {
                         return -1;

src/main/java/com/alibaba/druid/sql/ast/SQLLimit.java

@@ -0,0 +1,53 @@
+package com.alibaba.druid.sql.ast;
+
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+/**
+ * Created by wenshao on 16/9/25.
+ */
+public class SQLLimit extends SQLObjectImpl {
+
+    public SQLLimit() {
+
+    }
+
+    public SQLLimit(SQLExpr rowCount) {
+        this.setRowCount(rowCount);
+    }
+
+    private SQLExpr rowCount;
+    private SQLExpr offset;
+
+    public SQLExpr getRowCount() {
+        return rowCount;
+    }
+
+    public void setRowCount(SQLExpr rowCount) {
+        if (rowCount != null) {
+            rowCount.setParent(this);
+        }
+        this.rowCount = rowCount;
+    }
+
+    public SQLExpr getOffset() {
+        return offset;
+    }
+
+    public void setOffset(SQLExpr offset) {
+        if (offset != null) {
+            offset.setParent(this);
+        }
+        this.offset = offset;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, offset);
+            acceptChild(visitor, rowCount);
+        }
+        visitor.endVisit(this);
+    }
+
+}

src/main/java/com/alibaba/druid/sql/builder/impl/SQLSelectBuilderImpl.java

@@ -35,7 +35,7 @@ import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
 import com.alibaba.druid.sql.builder.SQLSelectBuilder;
 import com.alibaba.druid.sql.dialect.db2.ast.stmt.DB2SelectQueryBlock;
 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.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.odps.ast.OdpsSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelect;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectQueryBlock;
@@ -230,7 +230,7 @@ public class SQLSelectBuilderImpl implements SQLSelectBuilder {
         if (queryBlock instanceof MySqlSelectQueryBlock) {
             MySqlSelectQueryBlock mySqlQueryBlock = (MySqlSelectQueryBlock) queryBlock;
 
-            Limit limit = new Limit();
+            SQLLimit limit = new SQLLimit();
             limit.setRowCount(new SQLIntegerExpr(rowCount));
             if (offset > 0) {
                 limit.setOffset(new SQLIntegerExpr(offset));

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlDeleteStatement.java

@@ -22,7 +22,7 @@ import com.alibaba.druid.sql.ast.SQLCommentHint;
 import com.alibaba.druid.sql.ast.SQLOrderBy;
 import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
 import com.alibaba.druid.sql.ast.statement.SQLTableSource;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
@@ -36,7 +36,7 @@ public class MySqlDeleteStatement extends SQLDeleteStatement {
 
     private SQLTableSource       using;
     private SQLOrderBy           orderBy;
-    private Limit                limit;
+    private SQLLimit limit;
 
     private List<SQLCommentHint> hints;
 
@@ -99,11 +99,11 @@ public class MySqlDeleteStatement extends SQLDeleteStatement {
         this.orderBy = orderBy;
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         if (limit != null) {
             limit.setParent(this);
         }

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlSelectQueryBlock.java

@@ -18,10 +18,7 @@ package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 import java.util.ArrayList;
 import java.util.List;
 
-import com.alibaba.druid.sql.ast.SQLCommentHint;
-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.ast.*;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlObject;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
@@ -38,7 +35,7 @@ public class MySqlSelectQueryBlock extends SQLSelectQueryBlock implements MySqlO
     private Boolean              cache;
     private boolean              calcFoundRows;
 
-    private Limit                limit;
+    private SQLLimit limit;
 
     private SQLName              procedureName;
     private List<SQLExpr>        procedureArgumentList;
@@ -153,11 +150,11 @@ public class MySqlSelectQueryBlock extends SQLSelectQueryBlock implements MySqlO
         this.calcFoundRows = calcFoundRows;
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         if (limit != null) {
             limit.setParent(this);
         }
@@ -247,54 +244,4 @@ public class MySqlSelectQueryBlock extends SQLSelectQueryBlock implements MySqlO
         visitor.endVisit(this);
     }
 
-    public static class Limit extends SQLObjectImpl {
-
-        public Limit(){
-
-        }
-        
-        public Limit(SQLExpr rowCount){
-            this.setRowCount(rowCount);
-        }
-
-        private SQLExpr rowCount;
-        private SQLExpr offset;
-
-        public SQLExpr getRowCount() {
-            return rowCount;
-        }
-
-        public void setRowCount(SQLExpr rowCount) {
-            if (rowCount != null) {
-                rowCount.setParent(this);
-            }
-            this.rowCount = rowCount;
-        }
-
-        public SQLExpr getOffset() {
-            return offset;
-        }
-
-        public void setOffset(SQLExpr offset) {
-            if (offset != null) {
-                offset.setParent(this);
-            }
-            this.offset = offset;
-        }
-
-        @Override
-        protected void accept0(SQLASTVisitor visitor) {
-            if (visitor instanceof MySqlASTVisitor) {
-                MySqlASTVisitor mysqlVisitor = (MySqlASTVisitor) visitor;
-
-                if (mysqlVisitor.visit(this)) {
-                    acceptChild(visitor, offset);
-                    acceptChild(visitor, rowCount);
-                }
-                mysqlVisitor.endVisit(this);
-            }
-        }
-
-    }
-
 }

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlShowBinLogEventsStatement.java

@@ -16,14 +16,14 @@
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 
 public class MySqlShowBinLogEventsStatement extends MySqlStatementImpl implements MySqlShowStatement {
 
     private SQLExpr in;
     private SQLExpr from;
-    private Limit   limit;
+    private SQLLimit limit;
 
     public void accept0(MySqlASTVisitor visitor) {
         if (visitor.visit(this)) {
@@ -50,11 +50,11 @@ public class MySqlShowBinLogEventsStatement extends MySqlStatementImpl implement
         this.from = from;
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         if (limit != null) {
             limit.setParent(this);
         }

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlShowErrorsStatement.java

@@ -15,13 +15,13 @@
  */
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 
 public class MySqlShowErrorsStatement extends MySqlStatementImpl implements MySqlShowStatement {
 
     private boolean count = false;
-    private Limit   limit;
+    private SQLLimit limit;
 
     public boolean isCount() {
         return count;
@@ -31,11 +31,11 @@ public class MySqlShowErrorsStatement extends MySqlStatementImpl implements MySq
         this.count = count;
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         this.limit = limit;
     }
 

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlShowProfileStatement.java

@@ -19,7 +19,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 
 public class MySqlShowProfileStatement extends MySqlStatementImpl implements MySqlShowStatement {
@@ -28,7 +28,7 @@ public class MySqlShowProfileStatement extends MySqlStatementImpl implements MyS
 
     private SQLExpr    forQuery;
 
-    private Limit      limit;
+    private SQLLimit limit;
 
     public void accept0(MySqlASTVisitor visitor) {
         visitor.visit(this);
@@ -47,11 +47,11 @@ public class MySqlShowProfileStatement extends MySqlStatementImpl implements MyS
         this.forQuery = forQuery;
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         this.limit = limit;
     }
 

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlShowRelayLogEventsStatement.java

@@ -16,14 +16,14 @@
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 
 public class MySqlShowRelayLogEventsStatement extends MySqlStatementImpl implements MySqlShowStatement {
 
     private SQLExpr logName;
     private SQLExpr from;
-    private Limit   limit;
+    private SQLLimit limit;
 
     public SQLExpr getLogName() {
         return logName;
@@ -41,11 +41,11 @@ public class MySqlShowRelayLogEventsStatement extends MySqlStatementImpl impleme
         this.from = from;
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         this.limit = limit;
     }
 

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlShowWarningsStatement.java

@@ -15,13 +15,13 @@
  */
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 
 public class MySqlShowWarningsStatement extends MySqlStatementImpl implements MySqlShowStatement {
 
     private boolean count = false;
-    private Limit   limit;
+    private SQLLimit limit;
 
     public boolean isCount() {
         return count;
@@ -31,11 +31,11 @@ public class MySqlShowWarningsStatement extends MySqlStatementImpl implements My
         this.count = count;
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         this.limit = limit;
     }
 

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlUnionQuery.java

@@ -17,19 +17,19 @@ package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
 import com.alibaba.druid.sql.ast.statement.SQLUnionQuery;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlObject;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public class MySqlUnionQuery extends SQLUnionQuery implements MySqlObject {
 
-    private Limit limit;
+    private SQLLimit limit;
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         if (limit != null) {
             limit.setParent(this);
         }

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlUpdateStatement.java

@@ -15,14 +15,10 @@
  */
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLOrderBy;
-import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 import com.alibaba.druid.util.JdbcConstants;
@@ -30,7 +26,7 @@ import com.alibaba.druid.util.JdbcConstants;
 public class MySqlUpdateStatement extends SQLUpdateStatement implements MySqlStatement {
 
     private SQLOrderBy          orderBy;
-    private Limit               limit;
+    private SQLLimit limit;
 
     private boolean             lowPriority     = false;
     private boolean             ignore          = false;
@@ -43,11 +39,11 @@ public class MySqlUpdateStatement extends SQLUpdateStatement implements MySqlSta
         super(JdbcConstants.MYSQL);
     }
 
-    public Limit getLimit() {
+    public SQLLimit getLimit() {
         return limit;
     }
 
-    public void setLimit(Limit limit) {
+    public void setLimit(SQLLimit limit) {
         if (limit != null) {
             limit.setParent(this);
         }

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlExprParser.java

@@ -51,8 +51,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlMatchAgainstExpr.Search
 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.MySqlSelectQueryBlock;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.parser.Lexer;
 import com.alibaba.druid.sql.parser.ParserException;
 import com.alibaba.druid.sql.parser.SQLExprParser;
@@ -723,11 +722,11 @@ public class MySqlExprParser extends SQLExprParser {
         return super.nameRest(name);
     }
 
-    public Limit parseLimit() {
+    public SQLLimit parseLimit() {
         if (lexer.token() == Token.LIMIT) {
             lexer.nextToken();
 
-            MySqlSelectQueryBlock.Limit limit = new MySqlSelectQueryBlock.Limit();
+            SQLLimit limit = new SQLLimit();
 
             SQLExpr temp = this.expr();
             if (lexer.token() == (Token.COMMA)) {

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlSelectIntoParser.java

@@ -36,7 +36,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.MySqlUseIndexHint;
 import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlSelectIntoStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlOutFileExpr;
 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.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery;
 import com.alibaba.druid.sql.parser.ParserException;
 import com.alibaba.druid.sql.parser.SQLExprParser;
@@ -349,7 +349,7 @@ public class MySqlSelectIntoParser extends SQLSelectParser {
         return super.unionRest(union);
     }
 
-    public Limit parseLimit() {
+    public SQLLimit parseLimit() {
         return ((MySqlExprParser) this.exprParser).parseLimit();
     }
     

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlSelectParser.java

@@ -27,7 +27,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.MySqlIndexHintImpl;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlUseIndexHint;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlOutFileExpr;
 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.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUpdateStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUpdateTableSource;
@@ -450,7 +450,7 @@ public class MySqlSelectParser extends SQLSelectParser {
         return super.unionRest(union);
     }
 
-    public Limit parseLimit() {
+    public SQLLimit parseLimit() {
         return ((MySqlExprParser) this.exprParser).parseLimit();
     }
     

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java

@@ -132,7 +132,7 @@ 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.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetCharSetStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetNamesStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetPasswordStatement;
@@ -2312,7 +2312,7 @@ public class MySqlStatementParser extends SQLStatementParser {
         }
     }
 
-    public Limit parseLimit() {
+    public SQLLimit parseLimit() {
         return ((MySqlExprParser) this.exprParser).parseLimit();
     }
 

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitor.java

@@ -130,10 +130,6 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MysqlDeallocatePrepareS
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public interface MySqlASTVisitor extends SQLASTVisitor {
-    boolean visit(MySqlSelectQueryBlock.Limit x);
-
-    void endVisit(MySqlSelectQueryBlock.Limit x);
-
     boolean visit(MySqlTableIndex x);
 
     void endVisit(MySqlTableIndex x);

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitorAdapter.java

@@ -15,135 +15,17 @@
  */
 package com.alibaba.druid.sql.dialect.mysql.visitor;
 
-import com.alibaba.druid.sql.dialect.mysql.ast.MySqlForceIndexHint;
-import com.alibaba.druid.sql.dialect.mysql.ast.MySqlIgnoreIndexHint;
-import com.alibaba.druid.sql.dialect.mysql.ast.MySqlKey;
-import com.alibaba.druid.sql.dialect.mysql.ast.MySqlPrimaryKey;
-import com.alibaba.druid.sql.dialect.mysql.ast.MySqlUnique;
-import com.alibaba.druid.sql.dialect.mysql.ast.MySqlUseIndexHint;
-import com.alibaba.druid.sql.dialect.mysql.ast.MysqlForeignKey;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlCaseStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.*;
+import com.alibaba.druid.sql.dialect.mysql.ast.clause.*;
 import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlCaseStatement.MySqlWhenStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlCursorDeclareStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlDeclareConditionStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlDeclareHandlerStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlDeclareStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlIterateStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlLeaveStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlRepeatStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlSelectIntoStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlWhileStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlCharExpr;
-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.MySqlMatchAgainstExpr;
-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.CobarShowStatus;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableAlterColumn;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableChangeColumn;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableCharacter;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableDiscardTablespace;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableImportTablespace;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableModifyColumn;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableOption;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterUserStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAnalyzeStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlBinlogStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCommitStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCreateTableStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.expr.*;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.*;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCreateTableStatement.TableSpaceOption;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCreateUserStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCreateUserStatement.UserSpecification;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlDeleteStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlDescribeStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlExecuteStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlHelpStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlHintStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlInsertStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlKillStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlLoadDataInFileStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlLoadXmlStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlLockTableStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlOptimizeStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlPartitionByKey;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlPrepareStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlRenameTableStatement;
-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.MySqlSelectQueryBlock;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetCharSetStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetNamesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetPasswordStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetTransactionStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowAuthorsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowBinLogEventsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowBinaryLogsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCharacterSetStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCollationStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowColumnsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowContributorsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateDatabaseStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateEventStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateFunctionStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateProcedureStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateTableStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateTriggerStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateViewStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowDatabasesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowEngineStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowEnginesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowErrorsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowEventsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowFunctionCodeStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowFunctionStatusStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowGrantsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowIndexesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowKeysStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowMasterLogsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowMasterStatusStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowOpenTablesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowPluginsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowPrivilegesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowProcedureCodeStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowProcedureStatusStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowProcessListStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowProfileStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowProfilesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowRelayLogEventsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowSlaveHostsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowSlaveStatusStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowStatusStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowTableStatusStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowTriggersStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowVariantsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowWarningsStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlStartTransactionStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSubPartitionByKey;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSubPartitionByList;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlTableIndex;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnlockTablesStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUpdateStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUpdateTableSource;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MysqlDeallocatePrepareStatement;
 import com.alibaba.druid.sql.visitor.SQLASTVisitorAdapter;
 
 public class MySqlASTVisitorAdapter extends SQLASTVisitorAdapter implements MySqlASTVisitor {
 
-    @Override
-    public boolean visit(Limit x) {
-        return true;
-    }
-
-    @Override
-    public void endVisit(Limit x) {
-
-    }
-
     @Override
     public boolean visit(MySqlTableIndex x) {
         return true;

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlExportParameterVisitor.java

@@ -25,7 +25,7 @@ import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause;
 import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.visitor.ExportParameterVisitor;
 import com.alibaba.druid.sql.visitor.ExportParameterVisitorUtils;
 
@@ -34,7 +34,8 @@ public class MySqlExportParameterVisitor extends MySqlParameterizedOutputVisitor
     /**
      * true= if require parameterized sql output
      */
-    private final boolean requireParameterizedOutput;
+    private boolean requireParameterizedOutput;
+
 
     public MySqlExportParameterVisitor(List<Object> parameters, Appendable appender, boolean wantParameterizedOutput){
         super(appender);
@@ -68,7 +69,7 @@ public class MySqlExportParameterVisitor extends MySqlParameterizedOutputVisitor
     }
 
     @Override
-    public boolean visit(Limit x) {
+    public boolean visit(SQLLimit x) {
         if(requireParameterizedOutput){
             return super.visit(x);
         }

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java

@@ -30,7 +30,6 @@ import com.alibaba.druid.sql.ast.SQLSubPartitionBy;
 import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
-import com.alibaba.druid.sql.ast.expr.SQLNullExpr;
 import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableItem;
@@ -108,7 +107,7 @@ 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.MySqlSelectQueryBlock;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetCharSetStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetNamesStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetPasswordStatement;
@@ -361,17 +360,6 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
         return false;
     }
 
-    public boolean visit(MySqlSelectQueryBlock.Limit x) {
-        print0(ucase ? "LIMIT " : "limit ");
-        if (x.getOffset() != null) {
-            x.getOffset().accept(this);
-            print0(", ");
-        }
-        x.getRowCount().accept(this);
-
-        return false;
-    }
-
     public boolean visit(SQLDataType x) {
         print0(x.getName());
         if (!x.getArguments().isEmpty()) {
@@ -431,11 +419,6 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
         return false;
     }
 
-    @Override
-    public void endVisit(Limit x) {
-
-    }
-
     @Override
     public void endVisit(MySqlTableIndex x) {
 

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java

@@ -26,7 +26,6 @@ import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
-import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
 import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
 import com.alibaba.druid.sql.ast.statement.SQLTableSource;
@@ -91,7 +90,6 @@ 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.MySqlSelectQueryBlock;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetCharSetStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetNamesStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetPasswordStatement;
@@ -239,17 +237,6 @@ public class MySqlSchemaStatVisitor extends SchemaStatVisitor implements MySqlAS
         return false;
     }
 
-    @Override
-    public boolean visit(Limit x) {
-
-        return true;
-    }
-
-    @Override
-    public void endVisit(Limit x) {
-
-    }
-
     @Override
     public boolean visit(MySqlTableIndex x) {
 

src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java

@@ -26,28 +26,7 @@ import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 
-import com.alibaba.druid.sql.ast.SQLCommentHint;
-import com.alibaba.druid.sql.ast.SQLDataType;
-import com.alibaba.druid.sql.ast.SQLDeclareItem;
-import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.ast.SQLKeep;
-import com.alibaba.druid.sql.ast.SQLName;
-import com.alibaba.druid.sql.ast.SQLObject;
-import com.alibaba.druid.sql.ast.SQLOrderBy;
-import com.alibaba.druid.sql.ast.SQLOrderingSpecification;
-import com.alibaba.druid.sql.ast.SQLOver;
-import com.alibaba.druid.sql.ast.SQLParameter;
-import com.alibaba.druid.sql.ast.SQLPartition;
-import com.alibaba.druid.sql.ast.SQLPartitionBy;
-import com.alibaba.druid.sql.ast.SQLPartitionByHash;
-import com.alibaba.druid.sql.ast.SQLPartitionByList;
-import com.alibaba.druid.sql.ast.SQLPartitionByRange;
-import com.alibaba.druid.sql.ast.SQLPartitionValue;
-import com.alibaba.druid.sql.ast.SQLSetQuantifier;
-import com.alibaba.druid.sql.ast.SQLStatement;
-import com.alibaba.druid.sql.ast.SQLSubPartition;
-import com.alibaba.druid.sql.ast.SQLSubPartitionByHash;
-import com.alibaba.druid.sql.ast.SQLSubPartitionByList;
+import com.alibaba.druid.sql.ast.*;
 import com.alibaba.druid.sql.ast.expr.*;
 import com.alibaba.druid.sql.ast.statement.*;
 import com.alibaba.druid.sql.ast.statement.SQLCreateTriggerStatement.TriggerEvent;
@@ -3277,4 +3256,15 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Printab
         print('\'');
         return false;
     }
+
+    public boolean visit(SQLLimit x) {
+        print0(ucase ? "LIMIT " : "limit ");
+        if (x.getOffset() != null) {
+            x.getOffset().accept(this);
+            print0(", ");
+        }
+        x.getRowCount().accept(this);
+
+        return false;
+    }
 }

src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java

@@ -679,4 +679,7 @@ public interface SQLASTVisitor {
 
     boolean visit(SQLDateExpr x);
     void endVisit(SQLDateExpr x);
+
+    boolean visit(SQLLimit x);
+    void endVisit(SQLLimit x);
 }

src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java

@@ -15,23 +15,7 @@
  */
 package com.alibaba.druid.sql.visitor;
 
-import com.alibaba.druid.sql.ast.SQLCommentHint;
-import com.alibaba.druid.sql.ast.SQLDataType;
-import com.alibaba.druid.sql.ast.SQLDeclareItem;
-import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.ast.SQLKeep;
-import com.alibaba.druid.sql.ast.SQLObject;
-import com.alibaba.druid.sql.ast.SQLOrderBy;
-import com.alibaba.druid.sql.ast.SQLOver;
-import com.alibaba.druid.sql.ast.SQLParameter;
-import com.alibaba.druid.sql.ast.SQLPartition;
-import com.alibaba.druid.sql.ast.SQLPartitionByHash;
-import com.alibaba.druid.sql.ast.SQLPartitionByList;
-import com.alibaba.druid.sql.ast.SQLPartitionByRange;
-import com.alibaba.druid.sql.ast.SQLPartitionValue;
-import com.alibaba.druid.sql.ast.SQLSubPartition;
-import com.alibaba.druid.sql.ast.SQLSubPartitionByHash;
-import com.alibaba.druid.sql.ast.SQLSubPartitionByList;
+import com.alibaba.druid.sql.ast.*;
 import com.alibaba.druid.sql.ast.expr.*;
 import com.alibaba.druid.sql.ast.statement.*;
 import com.alibaba.druid.sql.ast.statement.SQLInsertStatement.ValuesClause;
@@ -1560,4 +1544,14 @@ public class SQLASTVisitorAdapter implements SQLASTVisitor {
     public void endVisit(SQLDateExpr x) {
 
     }
+
+    @Override
+    public boolean visit(SQLLimit x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(SQLLimit x) {
+
+    }
 }

src/main/java/com/alibaba/druid/wall/spi/MySqlWallVisitor.java

@@ -50,7 +50,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlDeleteStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlInsertStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlReplaceStatement;
 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.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowCreateTableStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUpdateStatement;
@@ -207,7 +207,7 @@ public class MySqlWallVisitor extends MySqlASTVisitorAdapter implements WallVisi
     }
 
     @Override
-    public boolean visit(Limit x) {
+    public boolean visit(SQLLimit x) {
         if (x.getRowCount() instanceof SQLNumericLiteralExpr) {
             WallContext context = WallContext.current();
 

src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java

@@ -73,7 +73,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlInsertStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlLockTableStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlRenameTableStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlReplaceStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
+import com.alibaba.druid.sql.ast.SQLLimit;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetCharSetStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSetNamesStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowGrantsStatement;
@@ -1171,7 +1171,7 @@ public class WallVisitorUtils {
                 return true;
             } else if (parent instanceof SQLOrderBy) {
                 return true;
-            } else if (parent instanceof Limit) {
+            } else if (parent instanceof SQLLimit) {
                 return true;
             } else if (parent instanceof MySqlOrderingExpr) {
                 return true;