Issue type:

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

Database system/driver:

[ ] cordova
[ ] mongodb
[ ] mssql
[ ] mysql / mariadb
[ ] oracle
[x] 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:

I have an entity with some fields of json object and array type. like:

  @Column({ type: 'jsonb', default: {} })
  data: object;
  @Column({ default: '{}', type: 'text', array: true)
  inventoryAvatars: string[];
  @Column({ default: '{}', type: 'text', array: true)
  inventoryEmoji: string[];

and a subscriber

@EventSubscriber()
export class UserSubscriber implements EntitySubscriberInterface<User> {
  listenTo() {
    return User;
  }
  afterUpdate(event: UpdateEvent<User>): Promise<any> | void {
    console.log(event.updatedColumns.map(x=>x.propertyName));
  }
}

now I found that after any changes made, all array/object type fields are in event.updatedColumns. even they are not modified.