TGooch44 commented on a change in pull request #2115:
URL: https://github.com/apache/iceberg/pull/2115#discussion_r561245043
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File path: python/iceberg/api/expressions/residual_evaluator.py
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@@ -15,98 +15,158 @@
# specific language governing permissions and limitations
# under the License.
+from .expression import Expression
from .expressions import Expressions, ExpressionVisitors
+from .literals import Literal
from .predicate import BoundPredicate, Predicate, UnboundPredicate
+from .reference import BoundReference
+from ..partition_spec import PartitionSpec
+from ..struct_like import StructLike
class ResidualEvaluator(object):
+ """
+ Finds the residuals for an {@link Expression} the partitions in the given
{@link PartitionSpec}.
- def __init__(self, spec, expr):
+ A residual expression is made by partially evaluating an expression using
partition values. For
+ example, if a table is partitioned by day(utc_timestamp) and is read with
a filter expression
+ utc_timestamp >= a and utc_timestamp <= b, then there are 4 possible
residuals expressions
+ for the partition data, d:
+
+
+ + If d > day(a) and d < day(b), the residual is always true
+ + If d == day(a) and d != day(b), the residual is utc_timestamp >= b
Review comment:
yes, definitely right since all values in the file will fall greater
than that lower bound. This looks like a typo/mistake, will update.
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