Filter might return duplicate results when the internal objects are similar.

e.g. input JSON both objects have name == {"first":"A","middle":"A"}

[{{"name":{"first":"A","middle":"A"},"rank":8},{"name":{"first":"A","middle":"A"},"rank":90}]

When running:

$[?($.name.first=="A")]

The following result is returned:

[{{"name":{"first":"A","middle":"A"},"rank":8},{"name":{"first":"A","middle":"A"},"rank":8},{{"name":{"first":"A","middle":"A"},"rank":90},{"name":{"first":"A","middle":"A"},"rank":90}]

It seems like the bug is in this code which compares all the candidates with all values and return each "parent" twice.

ref RedisJSON/RedisJSON#667