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This PR adds open_virtual_datatree for virtualizing higher-level hierarchical data structures.

Builds on #837

TODO:

  • Unit tests
  • Test with other backends (e.g., HDF)

Checklist:

  • Closes Support for groups #84
  • Tests added
  • Tests passing
  • Full type hint coverage
  • Changes are documented in docs/releases.rst
  • New functions/methods are listed in api.rst
  • New functionality has documentation

commit 113c712
Author: Ilan Gold <[email protected]>
Date:   Tue Nov 11 17:25:49 2025 +0100

    Update virtualizarr/tests/test_parsers/test_hdf/test_hdf.py

    Co-authored-by: Chuck Daniels <[email protected]>

commit 5693649
Author: Ilan Gold <[email protected]>
Date:   Tue Nov 11 17:25:10 2025 +0100

    refactor: `get_deepest_group_or_array` type

commit 849d567
Merge: 916c3e1 7a13261
Author: Ilan Gold <[email protected]>
Date:   Fri Nov 7 14:18:51 2025 +0100

    Merge branch 'main' into ig/nested_h5_group

commit 916c3e1
Merge: d8dc369 a2b65c1
Author: Ilan Gold <[email protected]>
Date:   Wed Sep 10 13:11:01 2025 +0200

    Merge branch 'main' into ig/nested_h5_group

commit d8dc369
Author: Ilan Gold <[email protected]>
Date:   Sun Sep 7 19:53:08 2025 +0200

    fix: update release note

commit a3a2615
Author: ilan-gold <[email protected]>
Date:   Sun Sep 7 16:45:22 2025 +0200

    chore: clean up error handling for non-metadata group requests + tests

commit fc0e999
Merge: 3036de8 1facb10
Author: ilan-gold <[email protected]>
Date:   Sun Sep 7 16:29:59 2025 +0200

    Merge branch 'ig/nested_h5_group' of https://github.com/ilan-gold/VirtualiZarr into ig/nested_h5_group

commit 3036de8
Author: ilan-gold <[email protected]>
Date:   Sun Sep 7 16:29:44 2025 +0200

    fix: remove subgroup check

commit 1facb10
Author: Ilan Gold <[email protected]>
Date:   Sun Sep 7 16:17:43 2025 +0200

    fix: wrong place!

commit 33e517e
Merge: afcaaed c1db925
Author: Ilan Gold <[email protected]>
Date:   Sun Sep 7 16:17:21 2025 +0200

    Merge branch 'main' into ig/nested_h5_group

commit afcaaed
Author: ilan-gold <[email protected]>
Date:   Sun Sep 7 16:15:26 2025 +0200

    chore: consolidate tests

commit 253d184
Author: ilan-gold <[email protected]>
Date:   Sun Sep 7 15:57:18 2025 +0200

    fix: disallow nested xarray handling

commit 57551b8
Author: ilan-gold <[email protected]>
Date:   Fri Aug 29 08:52:28 2025 +0200

    chore: relnote

commit 6fe1dbd
Author: ilan-gold <[email protected]>
Date:   Fri Aug 29 08:45:57 2025 +0200

    fix: typing

commit 85f2930
Author: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date:   Thu Aug 28 16:27:24 2025 +0000

    [pre-commit.ci] auto fixes from pre-commit.com hooks

    for more information, see https://pre-commit.ci

commit e92ba8c
Author: ilan-gold <[email protected]>
Date:   Thu Aug 28 18:19:46 2025 +0200

    fix: simplify node logic

commit 323be33
Author: ilan-gold <[email protected]>
Date:   Thu Aug 28 18:02:04 2025 +0200

    feat: nested groups
commit 128138b
Author: Max Jones <[email protected]>
Date:   Thu Nov 13 18:39:24 2025 -0500

    Apply suggestion from code review

commit 9c0e803
Author: Max Jones <[email protected]>
Date:   Thu Nov 13 18:25:39 2025 -0500

    Apply suggestions from code review

    Co-authored-by: Chuck Daniels <[email protected]>

commit d1595b4
Author: Max Jones <[email protected]>
Date:   Thu Nov 13 18:25:10 2025 -0500

    Update virtualizarr/manifests/store.py

    Co-authored-by: Chuck Daniels <[email protected]>

commit 1573992
Author: Max Jones <[email protected]>
Date:   Thu Nov 13 18:17:32 2025 -0500

    Add test for listing array in subgroup

commit dcf80bb
Author: Max Jones <[email protected]>
Date:   Thu Nov 13 15:25:10 2025 -0500

    Fix typing

commit 2448c5d
Author: Max Jones <[email protected]>
Date:   Thu Nov 13 15:08:33 2025 -0500

    Improve ManifestStore.list_dir for arrays and nested groups
@maxrjones maxrjones self-assigned this Nov 14, 2025
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codecov bot commented Nov 14, 2025

Codecov Report

❌ Patch coverage is 91.89189% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.45%. Comparing base (38ef649) to head (0da38c8).

Files with missing lines Patch % Lines
virtualizarr/xarray.py 90.00% 2 Missing ⚠️
virtualizarr/manifests/group.py 92.30% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main     #838      +/-   ##
==========================================
+ Coverage   88.40%   88.45%   +0.05%     
==========================================
  Files          35       35              
  Lines        2000     2035      +35     
==========================================
+ Hits         1768     1800      +32     
- Misses        232      235       +3     
Files with missing lines Coverage Δ
virtualizarr/__init__.py 75.00% <100.00%> (ø)
virtualizarr/manifests/store.py 88.97% <100.00%> (+0.24%) ⬆️
virtualizarr/manifests/group.py 93.22% <92.30%> (-0.26%) ⬇️
virtualizarr/xarray.py 86.06% <90.00%> (+0.62%) ⬆️
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