[FEAT] connect: df.get_attr

tests/connect/test_get_attr.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+
+def test_get_attr(spark_session):
+    # Create DataFrame from range(10)
+    df = spark_session.range(10)
+
+    # Get column using df[...]
+    # df.get_attr("id") is equivalent to df["id"]
+    df_col = df["id"]
+
+    # Check that column values match expected range
+    values = df.select(df_col).collect()  # Changed to select column first
+    assert len(values) == 10
+    assert [row[0] for row in values] == list(range(10))  # Need to extract values from Row objects