Fokko commented on code in PR #6139:
URL: https://github.com/apache/iceberg/pull/6139#discussion_r1015901564
##########
python/pyiceberg/expressions/__init__.py:
##########
@@ -32,6 +41,24 @@
B = TypeVar("B")
+def _to_literal(lit: Optional[Union[T, Literal[T]]]) -> Optional[Literal[T]]:
+ # This should not be optional, to be fixed in a separate PR
+ if lit:
+ return lit if isinstance(lit, Literal) else literal(lit)
+ else:
+ return None
+
+
+def _combine_into_set(values: Tuple[Union[T, Literal[T], Iterable[T],
Iterable[Literal[T]]], ...]) -> Set[Literal[T]]:
Review Comment:
From the signature of the `__new__` function of
`{In,NotIn,BoundIn,BoundNotIn}` you can see that you can also provide
positional arguments, I think that's a nice touch:
```python
def test_in_positional_args():
assert In(Reference("foo"), "a", "bc", "def").literals ==
{StringLiteral("a"), StringLiteral("bc"), StringLiteral("def")}
```
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