support cobar hints

src/main/java/com/alibaba/druid/mock/handler/MySqlMockExecuteHandlerImpl.java

@@ -102,6 +102,7 @@ public class MySqlMockExecuteHandlerImpl implements MockExecuteHandler {
         return rs;
     }
 
+    @SuppressWarnings("resource")
     public ResultSet executeQueryFromDual(MockStatement statement, SQLSelectQueryBlock query) throws SQLException {
         MockResultSet rs = new MockResultSet(statement);
         MockResultSetMetaData metaData = rs.getMockMetaData();

src/main/java/com/alibaba/druid/sql/parser/SQLStatementParser.java

@@ -215,6 +215,11 @@ public class SQLStatementParser extends SQLParser {
             if (parseStatementListDialect(statementList)) {
                 continue;
             }
+            
+            if (lexer.token() == Token.HINT) {
+                lexer.nextToken();
+                continue;
+            }
 
             throw new ParserException("TODO " + lexer.token() + " " + lexer.stringVal());
         }