aiida-core
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QueryBuilder: implement the `has_key` operator properly for SQLite based storage plugins
This was originally implemented, but the implementation (silently) yielded incorrect results, so it was removed out of precaution in https://github.com/aiidateam/aiida-core/pull/6497 When implementing it, special attention should be paid to it functioning properly in combination with the negation operator and in combination with other filter operations.