Added test case to lock in behaviour #48541
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added 2 commits
September 14, 2022 15:40
* In previous versions, concatenating to empty EA was resetting type information to np.object
mroeschke
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Sep 14, 2022
mroeschke
reviewed
Sep 14, 2022
mroeschke
reviewed
Sep 14, 2022
mroeschke
added
Testing
* whatsnew: made "Loss of dtype" more specific and improved wording (EA -> ExtensionArray, etc) * testcase: moved test case to test_empty.py and use `tm.assert_frame_equal()` with an expected dataframe
mroeschke
reviewed
Sep 15, 2022
doc/source/whatsnew/v1.6.0.rst
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| ExtensionArray | ||
| ^^^^^^^^^^^^^^ | ||
| - Bug in :meth:`Series.mean` overflowing unnecessarily with nullable integers (:issue:`48378`) | ||
| - When concatenating DataFrame containing an empty ExtensionArray Series with another DataFrame with an ExtensionArray of the same type, the resulting dtype turned into object (:issue:`48510`) |
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Suggested change
| - When concatenating DataFrame containing an empty ExtensionArray Series with another DataFrame with an ExtensionArray of the same type, the resulting dtype turned into object (:issue:`48510`) | |
| - Bug when concatenating an empty DataFrame with an ExtensionDtype to another DataFrame with the same ExtensionDtype, the resulting dtype turned into object (:issue:`48510`) |
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Looks to be some style issues: https://github.com/pandas-dev/pandas/actions/runs/3056453602/jobs/4930635737 |
added 2 commits
September 15, 2022 10:43
* Use concat/DataFrame as they were directly imported (instead of `pd...`)
mroeschke
approved these changes
Sep 15, 2022
mroeschke
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NA - MaskedArrays
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Thanks @ssche |
noatamir
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Nov 9, 2022
* Added test case to lock in behaviour * In previous versions, concatenating to empty EA was resetting type information to np.object * Update whatsnew * Addressed code review comments * whatsnew: made "Loss of dtype" more specific and improved wording (EA -> ExtensionArray, etc) * testcase: moved test case to test_empty.py and use `tm.assert_frame_equal()` with an expected dataframe * Fixed style issue * Use concat/DataFrame as they were directly imported (instead of `pd...`) * Improved whatsnew entry as per suggestion Co-authored-by: Sven <you@example.com>
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.I wasn't sure which issue to reference since it was resolved as part of something else, so I took this one for which I only really added a test case (not the actual fix). @mroeschke would you like me to reference another issue instead (or remove this from whatsnew entirely)?