Add test

fsspec/implementations/tests/test_reference.py

@@ -759,3 +759,27 @@ def test_append_parquet(lazy_refs, m):
     with pytest.raises(KeyError):
         lazy2["data/0"]
     assert lazy2["data/1"] == b"Adata"
+
+
+def test_deep_parq(m):
+    zarr = pytest.importorskip("zarr")
+    lz = fsspec.implementations.reference.LazyReferenceMapper.create(
+        "memory://out.parq", fs=m
+    )
+    g = zarr.open_group(lz, mode="w")
+    g2 = g.create_group("instant")
+    g2.create_dataset(name="one", data=[1, 2, 3])
+    lz.flush()
+
+    lz = fsspec.implementations.reference.LazyReferenceMapper("memory://out.parq", fs=m)
+    g = zarr.open_group(lz)
+    assert g.instant.one[:].tolist() == [1, 2, 3]
+    assert sorted(_["name"] for _ in lz.ls("")) == [".zgroup", ".zmetadata", "instant"]
+    assert sorted(_["name"] for _ in lz.ls("instant")) == [
+        "instant/.zgroup",
+        "instant/one",
+    ]
+    assert sorted(_["name"] for _ in lz.ls("instant/one")) == [
+        "instant/one/.zarray",
+        "instant/one/0",
+    ]