Erigara commented on code in PR #2029:
URL: https://github.com/apache/iceberg-python/pull/2029#discussion_r2098978290
##########
pyiceberg/expressions/visitors.py:
##########
@@ -894,12 +895,17 @@ def visit_unbound_predicate(self, predicate:
UnboundPredicate[L]) -> BooleanExpr
def visit_bound_predicate(self, predicate: BoundPredicate[L]) ->
BooleanExpression:
file_column_name =
self.file_schema.find_column_name(predicate.term.ref().field.field_id)
+ field_name = predicate.term.ref().field.name
if file_column_name is None:
# In the case of schema evolution, the column might not be present
# in the file schema when reading older data
if isinstance(predicate, BoundIsNull):
return AlwaysTrue()
+ # Projected fields are only available for identity partition fields
+ # Which mean that partition pruning excluded partition field which
evaluates to false
+ elif field_name in self.projected_missing_fields:
+ return AlwaysTrue()
Review Comment:
On the second look such an approach could lead to incorrect results in case
of some complex predicates.
For example `(P = x AND F = a) OR ( P = y AND F = b)` by substituting the
term `P = ...` we would get an incorrect predicate `F = a OR F = b`.
The correct approach here should be substituting `P` with concrete value
extracted from partition.
Not sure how to implement this feature.
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