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TST: Test key dtype cast after merge #29030

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Merged
merged 10 commits into from
Oct 22, 2019
Merged

TST: Test key dtype cast after merge #29030

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186292d
TST: Test key dtype cast after merge
albertvillanova Oct 16, 2019
6340d5d
Fix linting
albertvillanova Oct 16, 2019
7edbb2d
Use assert_frame_equal
albertvillanova Oct 17, 2019
e341b59
Merge branch 'master' into fix-17044
albertvillanova Oct 17, 2019
a471056
Remove comment
albertvillanova Oct 19, 2019
30801b9
Merge remote-tracking branch 'upstream/master' into fix-17044
albertvillanova Oct 19, 2019
728517b
Specify column order
albertvillanova Oct 19, 2019
0d6eeef
Format code according to black
albertvillanova Oct 20, 2019
bd9b267
Merge remote-tracking branch 'upstream/master' into fix-17044
albertvillanova Oct 20, 2019
ef9a9c5
Merge remote-tracking branch 'upstream/master' into fix-17044
albertvillanova Oct 21, 2019
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11 changes: 11 additions & 0 deletions pandas/tests/reshape/merge/test_merge.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1437,6 +1437,17 @@ def test_merge_on_ints_floats(self, int_vals, float_vals, exp_vals):
result = B.merge(A, left_on="Y", right_on="X")
assert_frame_equal(result, expected[["Y", "X"]])

def test_merge_key_dtype_cast(self):
# GH 17044
df1 = DataFrame({"key": [1.0, 2.0], "v1": [10, 20]}, columns=["key", "v1"])
df2 = DataFrame({"key": [2], "v2": [200]}, columns=["key", "v2"])
result = df1.merge(df2, on="key", how="left")
expected = DataFrame(
{"key": [1.0, 2.0], "v1": [10, 20], "v2": [np.nan, 200.0]},
columns=["key", "v1", "v2"],
)
tm.assert_frame_equal(result, expected)

def test_merge_on_ints_floats_warning(self):
# GH 16572
# merge will produce a warning when merging on int and
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