README.md

Beware of Entity Inheritance (performanceissue)

Problem:

When entity has relation to another entity that is part of Inheritance hierarchy, then loading the owning entity will cause additional query to determine which subclass should be loaded

→ Additional query for each entity in the result-set! (possibly thousands)

Solutions:

• You usually do not need inheritance
• Manually add JOIN and SELECT to the DQL queries (tests/src/InheritanceCausesAdditionalQuery/Solution/OccurrenceTest.php)