DEPR: deprecate SparseArray sparse_index parameter, add from_indices#64808
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jbrockmendel wants to merge 4 commits intopandas-dev:mainfrom
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DEPR: deprecate SparseArray sparse_index parameter, add from_indices#64808jbrockmendel wants to merge 4 commits intopandas-dev:mainfrom
jbrockmendel wants to merge 4 commits intopandas-dev:mainfrom
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jbrockmendel force-pushed the depr-43628 branch 2 times, most recently from 9f33f13 to 5f095f4 Compare 
Deprecate the `sparse_index` parameter of `SparseArray.__init__` and add a new `SparseArray.from_indices` classmethod that allows constructing a SparseArray from sparse values and their indices without materializing a dense array. Migrates all internal callers of `sparse_index=` to use `_simple_new()` to avoid triggering the deprecation warning. closes pandas-dev#43628 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
jbrockmendel force-pushed the depr-43628 branch from 9c71b00 to 370f827 Compare Use sanitize_array in from_indices to ensure consistent int64 dtype inference, matching SparseArray.__init__ behavior. Also fix test_ufunc to use explicit int64 dtype for the expected array. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
sparse_indexparameter ofSparseArray.__init__with aPandas4WarningSparseArray.from_indicesclassmethod for constructing a SparseArray from sparse values + indices without materializing a dense arraysparse_index=to_simple_new()to avoid triggering the deprecationcloses #43628
Test plan
TestFromIndicesclass with tests for basic integer, float, bool, block kind, empty, explicit dtype, length mismatch, invalid indices, and deprecation warningsparse_index=to wrap withassert_produces_warning(Pandas4Warning)🤖 Generated with Claude Code