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Diffstat (limited to 'python/pyspark/sql/tests.py')
| -rw-r--r-- | python/pyspark/sql/tests.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/python/pyspark/sql/tests.py b/python/pyspark/sql/tests.py index 5640bb5ea2..44c8b6a1aa 100644 --- a/python/pyspark/sql/tests.py +++ b/python/pyspark/sql/tests.py @@ -387,6 +387,11 @@ class SQLTests(ReusedPySparkTestCase): self.assertTrue(95 < g.agg(functions.approxCountDistinct(df.key)).first()[0]) self.assertEqual(100, g.agg(functions.countDistinct(df.value)).first()[0]) + def test_cov(self): + df = self.sc.parallelize([Row(a=i, b=2 * i) for i in range(10)]).toDF() + cov = df.stat.cov("a", "b") + self.assertTrue(abs(cov - 55.0 / 3) < 1e-6) + def test_math_functions(self): df = self.sc.parallelize([Row(a=i, b=2 * i) for i in range(10)]).toDF() from pyspark.sql import mathfunctions as functions |