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Inconsistent index between plain DataFrame and read_sql DataFrame #48193

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Aug 22, 2022
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17 changes: 17 additions & 0 deletions pandas/tests/io/test_sql.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2972,3 +2972,20 @@ def test_if_exists(self):
(5, "E"),
]
self.drop_table(table_name)

def test_index_consistency_df_and_sql_df(self):
# GH47608
cur = self.conn.cursor()

cur.execute("CREATE TABLE data (id int, val real)")
cur.execute("INSERT INTO data VALUES (1, 150.0), (2, 160.0)")
self.conn.commit()

result = pd.read_sql("SELECT * FROM data", self.conn)
expected = DataFrame({"id": [1, 2], "val": [150.0, 160.0]})
tm.assert_frame_equal(result, expected)

result = pd.read_sql("SELECT * FROM data WHERE (1 = 0)", self.conn)

expected = DataFrame({"id": [], "val": []})
tm.assert_frame_equal(result, expected)