Fix ds.merge to prevent altering original object depending on join value
#10596
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@dcherian I am taking a look and will report back findings. |
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Thanks! we have had this kind of issue before: #10330 Maybe a helper function is in order |
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#7736 mentions regression so we will want to make sure that we don't solve this by just copying aggressively. |
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Thanks for the pointer to #10330! I just took that logic and moved it outside the if block so that everybody has to go through it. I think the remaining tests are the same that are failing on main. |
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See #10599 for fixes to doctests and mypy. |
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It would probably be a good idea to run benchmarks on this PR. |
jsignell
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ds.merge can alter original object depending on join valueds.merge to prevent altering original object depending on join value
dcherian
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Aug 24, 2025
* main: (46 commits) use the new syntax of ignoring bots (pydata#10668) modification methods on `Coordinates` (pydata#10318) Silence warnings from test_tutorial.py (pydata#10661) test: update write_empty test for zarr 3.1.2 (pydata#10665) Bump actions/checkout from 4 to 5 in the actions group (pydata#10652) Add load_datatree function (pydata#10649) Support compute=False from DataTree.to_netcdf (pydata#10625) Fix typos (pydata#10655) In case of misconfiguration of dataset.encoding `unlimited_dims` warn instead of raise (pydata#10648) fix ``auto_complex`` for ``open_datatree`` (pydata#10632) Fix bug indexing with boolean scalars (pydata#10635) Improve DataTree typing (pydata#10644) Update Cartopy and Iris references (pydata#10645) Empty release notes (pydata#10642) release notes for v2025.08.0 (pydata#10641) Fix `ds.merge` to prevent altering original object depending on join value (pydata#10596) Add asynchronous load method (pydata#10327) Add DataTree.prune() method … (pydata#10598) Avoid refining parent dimensions in NetCDF files (pydata#10623) clarify lazy behaviour and eager loading chunks=None in open_*-functions (pydata#10627) ...
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So far this PR just adds some tests demonstrating howUsing certain join values ("exact" and "override") onmergecan alter the original objects.I discovered this in the context of #10062 (comment) but it's not really related to changes in that PR.
Closes #xxxxwhats-new.rstNew functions/methods are listed inapi.rst