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Query on multiple Pandas DataFrame (#89)
* Add dataframe.query() to run sql on multi dataframe * Add join dataframe test * Support passing dataframe as table
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Original file line number | Diff line number | Diff line change |
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#!python3 | ||
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import unittest | ||
import pandas as pd | ||
from chdb import dataframe as cdf | ||
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class TestJoinDf(unittest.TestCase): | ||
def test_1df(self): | ||
df1 = pd.DataFrame({"a": [1, 2, 3], "b": [b"one", b"two", b"three"]}) | ||
cdf1 = cdf.Table(dataframe=df1) | ||
ret1 = cdf.query(sql="select * from __tbl1__", tbl1=cdf1) | ||
self.assertEqual(str(ret1), str(df1)) | ||
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def test_2df(self): | ||
df1 = pd.DataFrame({"a": [1, 2, 3], "b": ["one", "two", "three"]}) | ||
df2 = pd.DataFrame({"c": [1, 2, 3], "d": ["①", "②", "③"]}) | ||
ret_tbl = cdf.query( | ||
sql="select * from __tbl1__ t1 join __tbl2__ t2 on t1.a = t2.c", | ||
tbl1=df1, | ||
tbl2=df2, | ||
) | ||
self.assertEqual( | ||
str(ret_tbl), | ||
str( | ||
pd.DataFrame( | ||
{ | ||
"a": [1, 2, 3], | ||
"b": [b"one", b"two", b"three"], | ||
"c": [1, 2, 3], | ||
"d": [b"\xe2\x91\xa0", b"\xe2\x91\xa1", b"\xe2\x91\xa2"], | ||
} | ||
) | ||
), | ||
) | ||
|
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ret_tbl2 = ret_tbl.query( | ||
"select b, a+c s from __table__ order by s" | ||
) | ||
self.assertEqual( | ||
str(ret_tbl2), | ||
str(pd.DataFrame({"b": [b"one", b"two", b"three"], "s": [2, 4, 6]})), | ||
) | ||
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if __name__ == "__main__": | ||
unittest.main() |
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