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test: Test the absence of implace modification on datetime64 normalization for pandas 2.0 #801

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Aug 30, 2023
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test: Test the absence of implace modification on datetime64 normalization for pandas 2.0 #801

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8833cfb
fix: Copy on resolution conversion
jjerphan Aug 29, 2023
455f0d5
test: Add test testing possible configurations
jjerphan Aug 29, 2023
0d99391
Revert change not to copy
jjerphan Aug 29, 2023
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15 changes: 15 additions & 0 deletions python/tests/unit/arcticdb/version_store/test_normalization.py
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Original file line number Diff line number Diff line change
Expand Up @@ -462,3 +462,18 @@ def test_columns_names_series_dynamic(lmdb_version_store_dynamic_schema, sym):

lmdb_version_store_dynamic_schema.write(sym + "dynamic_schema", date_series)
assert_series_equal(lmdb_version_store_dynamic_schema.read(sym + "dynamic_schema").data, date_series)


@pytest.mark.skipif(not IS_PANDAS_TWO, reason="pandas 2.0-specific test")
@pytest.mark.parametrize("datetime64_dtype", ["datetime64[s]", "datetime64[ms]", "datetime64[us]", "datetime64[ns]"])
@pytest.mark.parametrize("PandasContainer", [pd.DataFrame, pd.Series])
def test_no_inplace_index_array_modification(lmdb_version_store, sym, datetime64_dtype, PandasContainer):
# Normalization must not modify Series' or DataFrames' index array in-place.
pandas_container = PandasContainer(
data={"a": [1, 2, 3]},
index=pd.DatetimeIndex(["2020-01-01", "2020-01-02", "2020-01-03"], dtype=datetime64_dtype),
)
original_index_array = pandas_container.index
lmdb_version_store.write(sym, pandas_container)
assert pandas_container.index is original_index_array
assert pandas_container.index.dtype == datetime64_dtype