Fokko commented on code in PR #2561:
URL: https://github.com/apache/iceberg-python/pull/2561#discussion_r2440293359
##########
pyiceberg/expressions/__init__.py:
##########
@@ -743,12 +750,52 @@ def as_bound(self) -> Type[BoundNotIn[L]]:
return BoundNotIn[L]
-class LiteralPredicate(UnboundPredicate[L], ABC):
- literal: Literal[L]
+class LiteralPredicate(IcebergBaseModel, UnboundPredicate[L], ABC):
+ type: TypingLiteral["lt", "lt-eq", "gt", "gt-eq", "eq", "not-eq",
"starts-with", "not-starts-with"] = Field(alias="type")
+ term: UnboundTerm[Any]
+ value: Literal[L] = Field(alias="literal", serialization_alias="value")
+
+ model_config = ConfigDict(populate_by_name=True, frozen=True,
arbitrary_types_allowed=True)
+
+ def __init__(
+ self,
+ term: Union[str, UnboundTerm[Any], BoundReference[Any]],
+ literal: Union[L, Literal[L], None] = None,
+ **data: Any,
+ ) -> None: # pylint: disable=W0621
+ extra = dict(data)
+
+ literal_candidates = []
+ if literal is not None:
+ literal_candidates.append(literal)
+ if "literal" in extra:
+ literal_candidates.append(extra.pop("literal"))
+ if "value" in extra:
+ literal_candidates.append(extra.pop("value"))
+
+ literal_candidates = [candidate for candidate in literal_candidates if
candidate is not None]
+
+ if not literal_candidates:
+ raise TypeError("LiteralPredicate requires a literal or value
argument")
+ if len(literal_candidates) > 1:
+ raise TypeError("literal/value provided multiple times")
+
+ init = cast("Callable[..., None]", IcebergBaseModel.__init__)
+ init(self, term=_to_unbound_term(term),
literal=_to_literal(literal_candidates[0]), **extra)
+
+ @field_validator("term", mode="before")
+ @classmethod
+ def _convert_term(cls, value: Any) -> UnboundTerm[Any]:
+ return _to_unbound_term(value)
+
+ @field_validator("value", mode="before")
+ @classmethod
+ def _convert_value(cls, value: Any) -> Literal[Any]:
+ return _to_literal(value)
Review Comment:
I'm able to get the test passing with:
```suggestion
value: Literal[L] = Field()
model_config = ConfigDict(populate_by_name=True, frozen=True,
arbitrary_types_allowed=True)
def __init__(self, term: Union[str, UnboundTerm[Any]], literal: Union[L,
Literal[L]]): # pylint: disable=W0621
super().__init__(term=_to_unbound_term(term),
value=_to_literal(literal)) # pylint: disable=W0621
```
Less is more :)
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