Use buffer as the rawResult key may destroy the merge function from rawData to entity randomly

[sevenryze]

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:

1. Use the buffer as the db primary key.
2. Load enough amount of entities from the db using query builder.
3. The getRawMany() collection will bigger than getMany() collection, as the entities inside the getMany() result are merged by mistake, randomly.
4. You could use getRawManyAndEntities() to get the results to comparing.

I think it might be related to #2370 (comment) .

I will provide a PR to fix this problem, but i need you @pleerock to review if this workaround is proper and DO not failed any cases i havn't recall.

[sevenryze]

See PR #4221 , i already resolved this kind of issue.

[sevenryze]

Closed as the PR has been merged.