Nested groups not listed in zarr store (?) #2830
Description
Zarr version
v3.0.1
Numcodecs version
v0.15.0
Python Version
312
Operating System
Linux
Installation
Conda
Description
I am trying to create a Zarr store with nested groups using Dataset.to_zarr. The structure I aim to create looks like this:
/
├── Group1
│ ├── a () int64
│ ├── b () int64
│ └── subgroup1
│ ├── a () int64
│ └── b () int64
├── Group2
│ ├── a (2,) int64
│ └── b (2,) float64
├── a (3,) int64
└── set0 (2,) int64To generate this Zarr store, I use the following code:
Steps to reproduce
import xarray as xr
root_data = xr.Dataset({"a": ("y", [6, 7, 8]), "set0": ("x", [9, 10])})
set1_data = xr.Dataset({"a": 0, "b": 1})
set2_data = xr.Dataset({"a": ("y", [2, 3]), "b": ("x", [0.1, 0.2])})
root_data.to_zarr("unaligned.zarr")
set1_data.to_zarr("unaligned.zarr", group="/Group1", mode="a")
set2_data.to_zarr("unaligned.zarr", group="/Group2", mode="a")
set1_data.to_zarr("unaligned.zarr", group="/Group1/subgroup1", mode="a")When opening the store using zarr.open_group and listing the group members, only the root-level variables are displayed:
store = zarr.open_group("unaligned.zarr")
print([path for path, _ in store.members(max_depth=1000)])
['a', 'set0']
Expected Behavior
In Zarr-Python V2, the nested groups would be listed as expected:
['/', '/Group1', '/Group1/subgroup1', '/Group2']For more context, please look at this conversation