improved mysql sql parser. support alter table rename index.

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableRenameIndex.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 1999-2017 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.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterTableRenameIndex extends SQLObjectImpl implements SQLAlterTableItem {
+
+    private SQLName name;
+    private SQLName to;
+
+    public SQLAlterTableRenameIndex(SQLName name, SQLName to){
+        this.setName(name);
+        this.setTo(to);
+    }
+
+    public SQLAlterTableRenameIndex(){
+    }
+
+
+    public void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, name);
+            acceptChild(visitor, to);
+        }
+        visitor.endVisit(this);
+    }
+
+    public SQLName getName() {
+        return name;
+    }
+
+    public void setName(SQLName x) {
+        if (x != null) {
+            x.setParent(this);
+        }
+        this.name = x;
+    }
+
+    public SQLName getTo() {
+        return to;
+    }
+
+    public void setTo(SQLName x) {
+        if (x != null) {
+            x.setParent(this);
+        }
+        this.to = x;
+    }
+}

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

@@ -3651,6 +3651,17 @@ public class MySqlStatementParser extends SQLStatementParser {
                 }
             } else if (lexer.identifierEquals("RENAME")) {
                 lexer.nextToken();
+                
+                if (lexer.token() == Token.INDEX) {
+                    lexer.nextToken();
+                    SQLName name = this.exprParser.name();
+                    accept(Token.TO);
+                    SQLName to = this.exprParser.name();
+                    SQLAlterTableRenameIndex item = new SQLAlterTableRenameIndex(name, to);
+                    stmt.addItem(item);
+                    continue;
+                }
+
                 if (lexer.token() == Token.TO || lexer.token() == Token.AS) {
                     lexer.nextToken();
                 }

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

@@ -6130,4 +6130,12 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
         print('>');
         return false;
     }
+
+    public boolean visit(SQLAlterTableRenameIndex x) {
+        print0(ucase ? "RENAME INDEX " : "rename index ");
+        x.getName().accept(this);
+        print0(ucase ? " TO " : " to ");
+        x.getTo().accept(this);
+        return false;
+    }
 }

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

@@ -817,4 +817,7 @@ public interface SQLASTVisitor {
 
     boolean visit(SQLDropMaterializedViewStatement x);
     void endVisit(SQLDropMaterializedViewStatement x);
+
+    boolean visit(SQLAlterTableRenameIndex x);
+    void endVisit(SQLAlterTableRenameIndex x);
 }

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

@@ -1924,6 +1924,16 @@ public class SQLASTVisitorAdapter implements SQLASTVisitor {
 
     }
 
+    @Override
+    public boolean visit(SQLAlterTableRenameIndex x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(SQLAlterTableRenameIndex x) {
+
+    }
+
     public final boolean isEnabled(VisitorFeature feature) {
         return VisitorFeature.isEnabled(this.features, feature);
     }