test: add test for describe method using PyDict input

Author: kosiew

python/tests/test_dataframe.py

@@ -1870,6 +1870,25 @@ def test_describe(df):
     }
 
 
+def test_describe_from_pydict(ctx):
+    df = ctx.from_pydict({"a": [1, 2, 3], "b": [4, 5, 6], "c": [8, 5, 8]})
+    result = df.describe().to_pydict()
+    assert result == {
+        "describe": [
+            "count",
+            "null_count",
+            "mean",
+            "std",
+            "min",
+            "max",
+            "median",
+        ],
+        "a": [3.0, 0.0, 2.0, 1.0, 1.0, 3.0, 2.0],
+        "b": [3.0, 0.0, 5.0, 1.0, 4.0, 6.0, 5.0],
+        "c": [3.0, 0.0, 7.0, 1.7320508075688772, 5.0, 8.0, 8.0],
+    }
+
+
 def test_describe_mixed_numeric_string():
     ctx = SessionContext()
     batch = pa.RecordBatch.from_arrays(