Class inheritance without adding a new field breaks find (wrong SQL generated)

[nunoplopes]

Bug Report

Q	A
BC Break	?
Version	2.14.1

Summary

I have an abstract class with 1 field. An inherited class adds no extra fields.
Doing a repository find of the inherited class generates wrong SQL.

Current behavior

Throws an exception (Uncaught PDOException: SQLSTATE[HY000]: General error: 1 no such column: t0.name in Connection.php:60) due to broken SQL that is generated.
The generated SQL is:

SELECT t1.name AS name_2 FROM GitHubRepository t1 WHERE t0.name = ?

The code looks like:

/** @Entity */
abstract class Repository {
  /** @Id @Column(length=255) */
  public string $name;
}

/** @Entity */
class GitHubRepository extends \Repository {
  // no fields
}

// exception here:
$entityManager->find('GitHubRepository', $id);

In terms of tables, the table GitHubRepository has 1 column (name), and table Repository has no columns.

[nunoplopes]

Closing. I should be using @MappedSuperclass, not @Entity.

[mpdude]

I think that with #10431 (which is in the current 2.15.x-dev), you should have been given a deprecation notice for a missing inheritance declaration, and in 3.0, it would have been a failure.