rdblue commented on code in PR #4816:
URL: https://github.com/apache/iceberg/pull/4816#discussion_r883877185


##########
python/src/iceberg/expressions/base.py:
##########
@@ -267,6 +226,68 @@ def __str__(self) -> str:
         return "false"
 
 
+class UnboundIn(BooleanExpression, UnboundPredicate):
+    """IN operation expression"""
+
+    def __init__(self, left: "UnboundReference", right: List[Literal]):  # 
pylint: disable=super-init-not-called
+        self._left = left
+        self._right = right
+
+    @property
+    def left(self) -> "UnboundReference":
+        return self._left
+
+    @property
+    def right(self) -> List[Literal]:
+        return self._right
+
+    def __eq__(self, other) -> bool:
+        return id(self) == id(other) or (isinstance(other, UnboundIn) and 
self.left == other.left and self.right == other.right)

Review Comment:
   I think using separate cases will help this be more readable.



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