[GitHub] [spark] HyukjinKwon commented on a diff in pull request #38806: [SPARK-41268][CONNECT][PYTHON] Refactor "Column" for API Compatibility

[GitBox <gi...@apache.org>]

HyukjinKwon commented on code in PR #38806:
URL: https://github.com/apache/spark/pull/38806#discussion_r1034320960


##########
python/pyspark/sql/connect/column.py:
##########
@@ -314,3 +323,70 @@ def to_plan(self, session: "SparkConnectClient") -> proto.Expression:
 
     def __str__(self) -> str:
         return f"({self._op} ({', '.join([str(x) for x in self._args])}))"
+
+
+class Column(object):
+    """
+    A column in a DataFrame. Column can refer to different things based on the
+    wrapped expression. Some common examples include attribute references, functions,
+    literals, etc.
+
+    .. versionadded:: 3.4.0
+    """
+
+    def __init__(self, expr: Expression) -> None:
+        self._expr = expr
+
+    __gt__ = _bin_op(">")
+    __lt__ = _bin_op("<")
+    __add__ = _bin_op("+")
+    __sub__ = _bin_op("-")
+    __mul__ = _bin_op("*")
+    __div__ = _bin_op("/")
+    __truediv__ = _bin_op("/")
+    __mod__ = _bin_op("%")
+    __radd__ = _bin_op("+", reverse=True)
+    __rsub__ = _bin_op("-", reverse=True)
+    __rmul__ = _bin_op("*", reverse=True)
+    __rdiv__ = _bin_op("/", reverse=True)
+    __rtruediv__ = _bin_op("/", reverse=True)
+    __pow__ = _bin_op("pow")
+    __rpow__ = _bin_op("pow", reverse=True)
+    __ge__ = _bin_op(">=")
+    __le__ = _bin_op("<=")
+    # __eq__ = _bin_op("==")  # ignore [assignment]
+
+    def __eq__(self, other: Any) -> "Column":  # type: ignore[override]
+        """Returns a binary expression with the current column as the left
+        side and the other expression as the right side.
+        """
+        from pyspark.sql.connect._typing import PrimitiveType
+        from pyspark.sql.connect.functions import lit
+
+        if isinstance(other, get_args(PrimitiveType)):
+            other = lit(other)
+        return scalar_function("==", self, other)
+
+    def to_plan(self, session: "SparkConnectClient") -> proto.Expression:
+        return self._expr.to_plan(session)
+
+    def alias(self, *alias: str, **kwargs: Any) -> "Column":
+        return Column(self._expr.alias(*alias, **kwargs))
+
+    def desc(self) -> "Column":
+        return Column(self._expr.desc())
+
+    def asc(self) -> "Column":
+        return Column(self._expr.asc())
+
+    def ascending(self) -> bool:
+        return self._expr.ascending()
+
+    def nullsLast(self) -> bool:

Review Comment:
   Hm, PySpark's `Column` doesn't have this. In fact, `SortOrder` doesn't exist. Should probably match it with that.



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