HonahX commented on code in PR #539:
URL: https://github.com/apache/iceberg-python/pull/539#discussion_r1537148759
##########
pyiceberg/transforms.py:
##########
@@ -521,6 +556,16 @@ def project(self, name: str, pred: BoundPredicate[L]) ->
Optional[UnboundPredica
else:
raise ValueError(f"Could not project: {pred}")
+ def strict_project(self, name: str, pred: BoundPredicate[Any]) ->
Optional[UnboundPredicate[Any]]:
+ if isinstance(pred, BoundUnaryPredicate):
+ return pred.as_unbound(Reference(name))
+ elif isinstance(pred, BoundLiteralPredicate):
+ return pred.as_unbound(Reference(name), pred.literal)
+ elif isinstance(pred, BoundSetPredicate):
+ return pred.as_unbound(Reference(name), pred.literals)
+ else:
+ raise ValueError(f"Could not project: {pred}")
Review Comment:
I am a little bit confused here: why do we only raise error in
IdentityTransform?
##########
pyiceberg/expressions/visitors.py:
##########
@@ -1433,6 +1433,30 @@ def visit_not_starts_with(self, term: BoundTerm[L],
literal: Literal[L]) -> bool
return ROWS_MIGHT_MATCH
+def strict_projection(
+ schema: Schema, spec: PartitionSpec, case_sensitive: bool = True
+) -> Callable[[BooleanExpression], BooleanExpression]:
+ return StrictProjection(schema, spec, case_sensitive).project
+
+
+class StrictProjection(ProjectionEvaluator):
+ def visit_bound_predicate(self, predicate: BoundPredicate[Any]) ->
BooleanExpression:
+ parts =
self.spec.fields_by_source_id(predicate.term.ref().field.field_id)
+
+ result: BooleanExpression = AlwaysFalse()
+ for part in parts:
+ # consider (ts > 2019-01-01T01:00:00) with day(ts) and hour(ts)
+ # projections: d >= 2019-01-02 and h >= 2019-01-01-02 (note the
inclusive bounds).
+ # any timestamp where either projection predicate is true must
match the original
+ # predicate. For example, ts = 2019-01-01T03:00:00 matches the
hour projection but not
+ # the day, but does match the original predicate.
+ incl_projection = part.transform.strict_project(name=part.name,
pred=predicate)
Review Comment:
```suggestion
strict_projection =
part.transform.strict_project(name=part.name, pred=predicate)
```
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