[GitHub] [iceberg] CircArgs commented on a diff in pull request #5258: More Python Expressions

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

CircArgs commented on code in PR #5258:
URL: https://github.com/apache/iceberg/pull/5258#discussion_r919585687


##########
python/pyiceberg/expressions/base.py:
##########
@@ -172,13 +178,33 @@ def bind(self, schema: Schema, case_sensitive: bool) -> BoundReference[T]:
 @dataclass(frozen=True)  # type: ignore[misc]
 class BoundPredicate(Bound[T], BooleanExpression):
     term: BoundReference[T]
-    literals: Tuple[Literal[T], ...]
+    literals: Union[Tuple[Literal[T], ...], Literal[T]]
+    literals_len_lb: int = field(init=False, repr=False, hash=False, compare=False, default=1)
+    literals_len_ub: Optional[int] = field(init=False, repr=False, hash=False, compare=False, default=1)
+
+    def __post_init__(self):
+        if not isinstance(self.literals, tuple):
+            object.__setattr__(self, "literals", (self.literals,))
+        if not (self.literals_len_lb <= len(self.literals) <= (self.literals_len_ub or float("inf"))):  # type: ignore
+            raise AttributeError(
+                f"{self.__class__} expects a number of literals between at least {self.literals_len_lb} and at most {self.literals_len_ub or float('inf')}"
+            )
 
 
 @dataclass(frozen=True)  # type: ignore[misc]
 class UnboundPredicate(Unbound[T, BooleanExpression], BooleanExpression):
     term: Reference[T]
-    literals: Tuple[Literal[T], ...]
+    literals: Union[Tuple[Literal[T], ...], Literal[T]]
+    literals_len_lb: int = field(init=False, repr=False, hash=False, compare=False, default=1)

Review Comment:
   I figured `Optional` would imply it could be `None` (would be equivalent to `int | None` which I don't think makes sense



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