mysql parser ddl support

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

@@ -94,6 +94,7 @@ public class MySqlLexer extends Lexer {
         map.put("CAST", Token.CAST);
         map.put("IN", Token.IN);
         map.put("ASC", Token.ASC);
+        map.put("DESC", Token.DESC);
         map.put("LIKE", Token.LIKE);
         map.put("ESCAPE", Token.ESCAPE);
         map.put("BETWEEN", Token.BETWEEN);

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

@@ -244,19 +244,7 @@ public class MySqlStatementParser extends SQLStatementParser {
         
         stmt.setName(this.exprParser.name());
         
-        if (identifierEquals("USING")) {
-            lexer.nextToken();
-            
-            if (identifierEquals("BTREE")) {
-                stmt.setType("BTREE");
-                lexer.nextToken();
-            } else if (identifierEquals("HASH")) {
-                stmt.setType("HASH");
-                lexer.nextToken();
-            } else {
-                throw new ParserException("TODO " + lexer.token() + " " + lexer.stringVal());
-            }
-        }
+        parseCreateIndexUsing(stmt);
         
         accept(Token.ON);
         
@@ -275,9 +263,27 @@ public class MySqlStatementParser extends SQLStatementParser {
         }
         accept(Token.RPAREN);
         
+        parseCreateIndexUsing(stmt);
+        
         return stmt;
     }
 
+    private void parseCreateIndexUsing(MySqlCreateIndexStatement stmt) {
+        if (identifierEquals("USING")) {
+            lexer.nextToken();
+            
+            if (identifierEquals("BTREE")) {
+                stmt.setUsing("BTREE");
+                lexer.nextToken();
+            } else if (identifierEquals("HASH")) {
+                stmt.setUsing("HASH");
+                lexer.nextToken();
+            } else {
+                throw new ParserException("TODO " + lexer.token() + " " + lexer.stringVal());
+            }
+        }
+    }
+
     public SQLStatement parseCreateUser() throws ParserException {
         if (lexer.token() == Token.CREATE) {
             lexer.nextToken();

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

@@ -2221,18 +2221,17 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
         
         print("INDEX ");
         
-        if (x.getUsing() != null) {
-            print("USING ");
-            print(x.getUsing());
-            print(' ');
-        }
-
         x.getName().accept(this);
         print(" ON ");
         x.getTable().accept(this);
         print(" (");
         printAndAccept(x.getItems(), ", ");
         print(")");
+        
+        if (x.getUsing() != null) {
+            print(" USING ");
+            print(x.getUsing());
+        }
         return false;
     }