180 lines
6.2 KiB
Python
180 lines
6.2 KiB
Python
import numpy as np
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from pandas.core.dtypes.common import is_int64_dtype
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from pandas import (
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Index,
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RangeIndex,
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)
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import pandas._testing as tm
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class TestJoin:
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def test_join_outer(self):
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# join with Index[int64]
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index = RangeIndex(start=0, stop=20, step=2)
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other = Index(np.arange(25, 14, -1, dtype=np.int64))
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res, lidx, ridx = index.join(other, how="outer", return_indexers=True)
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noidx_res = index.join(other, how="outer")
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tm.assert_index_equal(res, noidx_res)
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eres = Index(
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[0, 2, 4, 6, 8, 10, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]
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)
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elidx = np.array(
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[0, 1, 2, 3, 4, 5, 6, 7, -1, 8, -1, 9, -1, -1, -1, -1, -1, -1, -1],
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dtype=np.intp,
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)
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eridx = np.array(
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[-1, -1, -1, -1, -1, -1, -1, -1, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0],
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dtype=np.intp,
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)
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assert isinstance(res, Index) and is_int64_dtype(res.dtype)
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assert not isinstance(res, RangeIndex)
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tm.assert_index_equal(res, eres, exact=True)
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tm.assert_numpy_array_equal(lidx, elidx)
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tm.assert_numpy_array_equal(ridx, eridx)
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# join with RangeIndex
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other = RangeIndex(25, 14, -1)
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res, lidx, ridx = index.join(other, how="outer", return_indexers=True)
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noidx_res = index.join(other, how="outer")
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tm.assert_index_equal(res, noidx_res)
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assert isinstance(res, Index) and res.dtype == np.int64
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assert not isinstance(res, RangeIndex)
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tm.assert_index_equal(res, eres)
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tm.assert_numpy_array_equal(lidx, elidx)
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tm.assert_numpy_array_equal(ridx, eridx)
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def test_join_inner(self):
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# Join with non-RangeIndex
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index = RangeIndex(start=0, stop=20, step=2)
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other = Index(np.arange(25, 14, -1, dtype=np.int64))
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res, lidx, ridx = index.join(other, how="inner", return_indexers=True)
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# no guarantee of sortedness, so sort for comparison purposes
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ind = res.argsort()
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res = res.take(ind)
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lidx = lidx.take(ind)
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ridx = ridx.take(ind)
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eres = Index([16, 18])
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elidx = np.array([8, 9], dtype=np.intp)
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eridx = np.array([9, 7], dtype=np.intp)
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assert isinstance(res, Index) and res.dtype == np.int64
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tm.assert_index_equal(res, eres)
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tm.assert_numpy_array_equal(lidx, elidx)
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tm.assert_numpy_array_equal(ridx, eridx)
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# Join two RangeIndex
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other = RangeIndex(25, 14, -1)
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res, lidx, ridx = index.join(other, how="inner", return_indexers=True)
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assert isinstance(res, RangeIndex)
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tm.assert_index_equal(res, eres, exact="equiv")
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tm.assert_numpy_array_equal(lidx, elidx)
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tm.assert_numpy_array_equal(ridx, eridx)
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def test_join_left(self):
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# Join with Index[int64]
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index = RangeIndex(start=0, stop=20, step=2)
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other = Index(np.arange(25, 14, -1, dtype=np.int64))
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res, lidx, ridx = index.join(other, how="left", return_indexers=True)
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eres = index
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eridx = np.array([-1, -1, -1, -1, -1, -1, -1, -1, 9, 7], dtype=np.intp)
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assert isinstance(res, RangeIndex)
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tm.assert_index_equal(res, eres)
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assert lidx is None
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tm.assert_numpy_array_equal(ridx, eridx)
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# Join withRangeIndex
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other = Index(np.arange(25, 14, -1, dtype=np.int64))
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res, lidx, ridx = index.join(other, how="left", return_indexers=True)
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assert isinstance(res, RangeIndex)
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tm.assert_index_equal(res, eres)
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assert lidx is None
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tm.assert_numpy_array_equal(ridx, eridx)
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def test_join_right(self):
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# Join with Index[int64]
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index = RangeIndex(start=0, stop=20, step=2)
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other = Index(np.arange(25, 14, -1, dtype=np.int64))
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res, lidx, ridx = index.join(other, how="right", return_indexers=True)
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eres = other
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elidx = np.array([-1, -1, -1, -1, -1, -1, -1, 9, -1, 8, -1], dtype=np.intp)
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assert isinstance(other, Index) and other.dtype == np.int64
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tm.assert_index_equal(res, eres)
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tm.assert_numpy_array_equal(lidx, elidx)
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assert ridx is None
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# Join withRangeIndex
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other = RangeIndex(25, 14, -1)
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res, lidx, ridx = index.join(other, how="right", return_indexers=True)
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eres = other
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assert isinstance(other, RangeIndex)
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tm.assert_index_equal(res, eres)
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tm.assert_numpy_array_equal(lidx, elidx)
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assert ridx is None
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def test_join_non_int_index(self):
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index = RangeIndex(start=0, stop=20, step=2)
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other = Index([3, 6, 7, 8, 10], dtype=object)
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outer = index.join(other, how="outer")
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outer2 = other.join(index, how="outer")
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expected = Index([0, 2, 3, 4, 6, 7, 8, 10, 12, 14, 16, 18])
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tm.assert_index_equal(outer, outer2)
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tm.assert_index_equal(outer, expected)
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inner = index.join(other, how="inner")
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inner2 = other.join(index, how="inner")
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expected = Index([6, 8, 10])
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tm.assert_index_equal(inner, inner2)
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tm.assert_index_equal(inner, expected)
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left = index.join(other, how="left")
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tm.assert_index_equal(left, index.astype(object))
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left2 = other.join(index, how="left")
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tm.assert_index_equal(left2, other)
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right = index.join(other, how="right")
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tm.assert_index_equal(right, other)
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right2 = other.join(index, how="right")
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tm.assert_index_equal(right2, index.astype(object))
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def test_join_non_unique(self):
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index = RangeIndex(start=0, stop=20, step=2)
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other = Index([4, 4, 3, 3])
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res, lidx, ridx = index.join(other, return_indexers=True)
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eres = Index([0, 2, 4, 4, 6, 8, 10, 12, 14, 16, 18])
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elidx = np.array([0, 1, 2, 2, 3, 4, 5, 6, 7, 8, 9], dtype=np.intp)
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eridx = np.array([-1, -1, 0, 1, -1, -1, -1, -1, -1, -1, -1], dtype=np.intp)
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tm.assert_index_equal(res, eres)
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tm.assert_numpy_array_equal(lidx, elidx)
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tm.assert_numpy_array_equal(ridx, eridx)
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def test_join_self(self, join_type):
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index = RangeIndex(start=0, stop=20, step=2)
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joined = index.join(index, how=join_type)
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assert index is joined
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