Column name in QueryBuilder's orderBy is NOT escaped

Issue type:

[ ] question [x] bug report [ ] feature request [ ] documentation issue

Database system/driver:

[ ] cordova [ ] mongodb [ ] mssql [x] mysql / mariadb [ ] oracle [ ] postgres [ ] cockroachdb [ ] sqlite [ ] sqljs [ ] react-native [ ] expo

TypeORM version:

[x] latest [ ] @next [ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

Pass a column name like key to QueryBuilder’s orderBy, the generated SQL will be ORDER BY key ASC which causes error.

[d3-dmitriy-onypko]

Same issue. Also @Menci { '`key`': xxx } does not help. You need { `"key"`: xxx }

[Menci]

I’m sorry. It’s not .find(), it’s QueryBuilder’s .orderBy(). Code is below:

const TypeORM = require("typeorm");

const TestTable = new TypeORM.EntitySchema({
    name: "test_table",
    columns: {
        key: {
            primary: true,
            type: "int",
            generated: true
        }
    }
});

TypeORM.createConnection({
    type: "mysql",
    host: "localhost",
    port: 3306,
    username: "syzoj",
    password: "3RckWNyUTrwdNx97",
    database: "syzoj",
    synchronize: true,
    logging: true,
    entities: [TestTable]
}).then(connection => {
    connection.getRepository('test_table').createQueryBuilder()
      .select('*')
      .orderBy({
        key: 'DESC'
      })
      .getMany();
});