Issue type:

• question
• bug report
• feature request
• documentation issue

Database system/driver:

• cordova
• mongodb
• mssql
• mysql / mariadb
• oracle
• postgres
• cockroachdb
• sqlite
• sqljs
• react-native
• expo

TypeORM version:

• latest
• @next
• 0.2.18 (or put your version here)

Steps to reproduce or a small repository showing the problem:

import {
  Entity, Column,
} from 'typeorm';

@Entity()
export class User {
  @Column({
    type: 'varchar',
    nullable: false,
    comment: 'The name of the user (i.e Samuel Jenkins)',
  })
  public name: string;
}

In MySQL this comment would be persisted to the database when a migration is generated (the migration would contain a SQL statement including the comment). In PostgreSQL.....that's not the case.