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Fix column name as a tuple in multi column index #1191

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Jan 14, 2020
Merged

Fix column name as a tuple in multi column index #1191

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7 changes: 4 additions & 3 deletions databricks/koalas/internal.py
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Original file line number Diff line number Diff line change
Expand Up @@ -742,9 +742,10 @@ def from_pandas(pdf: pd.DataFrame) -> '_InternalFrame':
index_map = [(SPARK_INDEX_NAME_FORMAT(i), None)
for i in range(len(index.levels))]
else:
index_map = [(SPARK_INDEX_NAME_FORMAT(i) if name is None else name,
name if name is None or isinstance(name, tuple) else (name,))
for i, name in enumerate(index.names)]
index_map = [
(SPARK_INDEX_NAME_FORMAT(i) if name is None else name_like_string(name),
name if name is None or isinstance(name, tuple) else (name,))
for i, name in enumerate(index.names)]
else:
name = index.name
index_map = [(name_like_string(name)
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7 changes: 7 additions & 0 deletions databricks/koalas/tests/test_indexes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -517,6 +517,13 @@ def test_multiindex_from_product(self):

self.assert_eq(pidx, kidx)

def test_multiindex_tuple_column_name(self):
column_index = pd.MultiIndex.from_tuples([('a', 'x'), ('a', 'y'), ('b', 'z')])
pdf = pd.DataFrame([[1, 2, 3], [4, 5, 6], [7, 8, 9]], columns=column_index)
pdf.set_index(('a', 'x'), append=True, inplace=True)
kdf = ks.from_pandas(pdf)
self.assert_eq(pdf, kdf)

def test_len(self):
pidx = pd.Index(range(10000))
kidx = ks.Index(range(10000))
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