Geometry array column causes error in PostgresQueryRunner when synchronizing

[RobbieGM]

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
[x] 0.2.24 (latest) and 0.2.22 and 0.2.15

Steps to reproduce or a small repository showing the problem:

Create a model with a spatial column in a postgres database. For example:

import type { Point } from "geojson";

class Test {
  @Column('geometry', { spatialFeatureType: 'Point', srid: 4326, array: true })
  locations!: Point[];
}

The error happens when creating a connection and saving/synchronizing the new schema. The error given is:

TypeError: Cannot read property 'type' of undefined
    at PostgresQueryRunner.<anonymous> (C:\Users\Robbie\Code\project\node_modules\typeorm\driver\postgres\PostgresQueryRunner.js:2062:109)
    at step (C:\Users\Robbie\Code\project\node_modules\tslib\tslib.js:136:27)

The actual location of this error in the uncompiled TS code is here. This error has been reported before in #5747 but that issue blames the problem on changes in recent versions. I have this problem in a few different versions of typeorm, 0.2.24 (latest) and 0.2.22 and 0.2.15, so it doesn't seem to be something new.

[RobbieGM]

Just made a bug repro for this and.. the bug isn't there! It it most likely an issue with my code somehow, although TypeORM is involved. I'll close this issue for now.

[RobbieGM]

I figured out what was happening. The problem happens when you try to make an array of geolocations, and I hadn't synchronized the database so the above code doesn't reproduce the error, but this repository should.
To reproduce:

1. Clone repository
2. Set your DATABASE_URL environment variable to a postgres database url.
3. Run npm start once to set up the database tables.
4. Run it again and it will throw an error when trying to diff the database.