bug fixed for mysql parser.

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

@@ -821,7 +821,13 @@ public class MySqlCreateTableParser extends SQLCreateTableParser {
 
             accept(Token.LPAREN);
             for (;;) {
-                SQLExpr expr = this.exprParser.expr();
+                SQLExpr expr;
+                if (lexer.token() == Token.LITERAL_ALIAS) {
+                    expr = this.exprParser.name();
+                    expr = this.exprParser.primaryRest(expr);
+                } else {
+                    expr = this.exprParser.expr();
+                }
                 if (lexer.token() == Token.ASC) {
                     lexer.nextToken();
                     expr = new MySqlOrderingExpr(expr, SQLOrderingSpecification.ASC);

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

@@ -705,7 +705,13 @@ public class MySqlExprParser extends SQLExprParser {
 
         accept(Token.LPAREN);
         for (;;) {
-            primaryKey.addColumn(this.expr());
+            SQLExpr expr;
+            if (lexer.token() == Token.LITERAL_ALIAS) {
+                expr = this.name();
+            } else {
+                expr = this.expr();
+            }
+            primaryKey.addColumn(expr);
             if (!(lexer.token() == (Token.COMMA))) {
                 break;
             } else {
@@ -965,4 +971,9 @@ public class MySqlExprParser extends SQLExprParser {
         }
         return partitionDef;
     }
+
+    protected SQLExpr parseAliasExpr(String alias) {
+        String chars = alias.substring(1, alias.length() - 1);
+        return new SQLCharExpr(chars);
+    }
 }

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

@@ -3651,7 +3651,7 @@ public class MySqlStatementParser extends SQLStatementParser {
                 }
             } else if (lexer.identifierEquals("RENAME")) {
                 lexer.nextToken();
-                
+
                 if (lexer.token() == Token.INDEX) {
                     lexer.nextToken();
                     SQLName name = this.exprParser.name();