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040000 tree d6f21dd565ce72844137e2b076dd94ee0140c273	filter
040000 tree caec86f6b467ecc661a8207e3f655d84e0336fbb	join
040000 tree 20524af7fe3ac040ae81d9939078023570efa0d4	projection
040000 tree 7cca7a90bf805508f5daf3e08ca01015b651ac40	sp
040000 tree c91ebae5cccf1558764b04e3a03eb37060fbc5af	temporal