fix table.delete()/overwrite() with null values

pyiceberg/expressions/__init__.py

@@ -135,6 +135,10 @@ def __repr__(self) -> str:
     def ref(self) -> BoundReference[L]:
         return self
 
+    def __hash__(self) -> int:
+        """Return hash value of the BoundReference class."""
+        return hash(str(self))
+
 
 class UnboundTerm(Term[Any], Unbound[BoundTerm[L]], ABC):
     """Represents an unbound term."""

pyiceberg/io/pyarrow.py

@@ -73,11 +73,7 @@
 
 from pyiceberg.conversions import to_bytes
 from pyiceberg.exceptions import ResolveError
-from pyiceberg.expressions import (
-    AlwaysTrue,
-    BooleanExpression,
-    BoundTerm,
-)
+from pyiceberg.expressions import AlwaysTrue, BooleanExpression, BoundIsNaN, BoundIsNull, BoundReference, BoundTerm, Not, Or
 from pyiceberg.expressions.literals import Literal
 from pyiceberg.expressions.visitors import (
     BoundBooleanExpressionVisitor,
@@ -638,10 +634,165 @@ def visit_or(self, left_result: pc.Expression, right_result: pc.Expression) -> p
         return left_result | right_result
 
 
+class _NullNaNUnmentionedTermsCollector(BoundBooleanExpressionVisitor[Any]):
+    # BoundTerms which have either is_null or is_not_null appearing at least once in the boolean expr.
+    is_null_or_not_bound_terms: set[BoundTerm[Any]]
+    # The remaining BoundTerms appearing in the boolean expr.
+    null_unmentioned_bound_terms: set[BoundTerm[Any]]
+    # BoundTerms which have either is_nan or is_not_nan appearing at least once in the boolean expr.
+    is_nan_or_not_bound_terms: set[BoundTerm[Any]]
+    # The remaining BoundTerms appearing in the boolean expr.
+    nan_unmentioned_bound_terms: set[BoundTerm[Any]]
+
+    def __init__(self) -> None:
+        self.is_null_or_not_bound_terms = set()
+        self.null_unmentioned_bound_terms = set()
+        self.is_nan_or_not_bound_terms = set()
+        self.nan_unmentioned_bound_terms = set()
+        super().__init__()
+
+    def _handle_explicit_is_null_or_not(self, term: BoundTerm[Any]) -> None:
+        """Handle the predicate case where either is_null or is_not_null is included."""
+        if term in self.null_unmentioned_bound_terms:
+            self.null_unmentioned_bound_terms.remove(term)
+        self.is_null_or_not_bound_terms.add(term)
+
+    def _handle_null_unmentioned(self, term: BoundTerm[Any]) -> None:
+        """Handle the predicate case where neither is_null or is_not_null is included."""
+        if term not in self.is_null_or_not_bound_terms:
+            self.null_unmentioned_bound_terms.add(term)
+
+    def _handle_explicit_is_nan_or_not(self, term: BoundTerm[Any]) -> None:
+        """Handle the predicate case where either is_nan or is_not_nan is included."""
+        if term in self.nan_unmentioned_bound_terms:
+            self.nan_unmentioned_bound_terms.remove(term)
+        self.is_nan_or_not_bound_terms.add(term)
+
+    def _handle_nan_unmentioned(self, term: BoundTerm[Any]) -> None:
+        """Handle the predicate case where neither is_nan or is_not_nan is included."""
+        if term not in self.is_nan_or_not_bound_terms:
+            self.nan_unmentioned_bound_terms.add(term)
+
+    def visit_in(self, term: BoundTerm[pc.Expression], literals: Set[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_not_in(self, term: BoundTerm[pc.Expression], literals: Set[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_is_nan(self, term: BoundTerm[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_explicit_is_nan_or_not(term)
+
+    def visit_not_nan(self, term: BoundTerm[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_explicit_is_nan_or_not(term)
+
+    def visit_is_null(self, term: BoundTerm[Any]) -> None:
+        self._handle_explicit_is_null_or_not(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_not_null(self, term: BoundTerm[Any]) -> None:
+        self._handle_explicit_is_null_or_not(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_equal(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_not_equal(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_greater_than_or_equal(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_greater_than(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_less_than(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_less_than_or_equal(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_starts_with(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_not_starts_with(self, term: BoundTerm[Any], literal: Literal[Any]) -> None:
+        self._handle_null_unmentioned(term)
+        self._handle_nan_unmentioned(term)
+
+    def visit_true(self) -> None:
+        return
+
+    def visit_false(self) -> None:
+        return
+
+    def visit_not(self, child_result: pc.Expression) -> None:
+        return
+
+    def visit_and(self, left_result: pc.Expression, right_result: pc.Expression) -> None:
+        return
+
+    def visit_or(self, left_result: pc.Expression, right_result: pc.Expression) -> None:
+        return
+
+    def collect(
+        self,
+        expr: BooleanExpression,
+    ) -> None:
+        """Collect the bound references categorized by having at least one is_null or is_not_null in the expr and the remaining."""
+        boolean_expression_visit(expr, self)
+
+
 def expression_to_pyarrow(expr: BooleanExpression) -> pc.Expression:
     return boolean_expression_visit(expr, _ConvertToArrowExpression())
 
 
+def _expression_to_complementary_pyarrow(expr: BooleanExpression) -> pc.Expression:
+    """Complementary filter conversion function of expression_to_pyarrow.
+
+    Could not use expression_to_pyarrow(Not(expr)) to achieve this complementary effect because ~ in pyarrow.compute.Expression does not handle null.
+    """
+    collector = _NullNaNUnmentionedTermsCollector()
+    collector.collect(expr)
+
+    def _downcast_term_to_reference(bound_terms: Set[BoundTerm[Any]]) -> Set[BoundReference[Any]]:
+        """Handle mypy check for BoundTerm -> BoundReference."""
+        bound_refs: Set[BoundReference[Any]] = set()
+        for t in bound_terms:
+            if not isinstance(t, BoundReference):
+                raise ValueError("Collected Bound Term that is not reference.")
+            else:
+                bound_refs.add(t)
+        return bound_refs
+
+    null_unmentioned_bound_refs: Set[BoundReference[Any]] = _downcast_term_to_reference(collector.null_unmentioned_bound_terms)
+    nan_unmentioned_bound_refs: Set[BoundReference[Any]] = _downcast_term_to_reference(collector.nan_unmentioned_bound_terms)
+
+    # Convert the set of references to a sorted list so that layout of the expression to build is deterministic.
+    null_unmentioned_bound_refs_sorted: List[BoundReference[Any]] = sorted(
+        null_unmentioned_bound_refs, key=lambda ref: ref.field.name
+    )
+    nan_unmentioned_bound_refs_sorted: List[BoundReference[Any]] = sorted(
+        nan_unmentioned_bound_refs, key=lambda ref: ref.field.name
+    )
+
+    preserve_expr: BooleanExpression = Not(expr)
+    for term in null_unmentioned_bound_refs_sorted:
+        preserve_expr = Or(preserve_expr, BoundIsNull(term=term))
+    for term in nan_unmentioned_bound_refs_sorted:
+        preserve_expr = Or(preserve_expr, BoundIsNaN(term=term))
+    return expression_to_pyarrow(preserve_expr)
+
+
 @lru_cache
 def _get_file_format(file_format: FileFormat, **kwargs: Dict[str, Any]) -> ds.FileFormat:
     if file_format == FileFormat.PARQUET:

pyiceberg/table/__init__.py

@@ -58,7 +58,6 @@
     And,
     BooleanExpression,
     EqualTo,
-    Not,
     Or,
     Reference,
 )
@@ -576,7 +575,11 @@ def delete(self, delete_filter: Union[str, BooleanExpression], snapshot_properti
             delete_filter: A boolean expression to delete rows from a table
             snapshot_properties: Custom properties to be added to the snapshot summary
         """
-        from pyiceberg.io.pyarrow import _dataframe_to_data_files, expression_to_pyarrow, project_table
+        from pyiceberg.io.pyarrow import (
+            _dataframe_to_data_files,
+            _expression_to_complementary_pyarrow,
+            project_table,
+        )
 
         if (
             self.table_metadata.properties.get(TableProperties.DELETE_MODE, TableProperties.DELETE_MODE_DEFAULT)
@@ -593,7 +596,7 @@ def delete(self, delete_filter: Union[str, BooleanExpression], snapshot_properti
         # Check if there are any files that require an actual rewrite of a data file
         if delete_snapshot.rewrites_needed is True:
             bound_delete_filter = bind(self._table.schema(), delete_filter, case_sensitive=True)
-            preserve_row_filter = expression_to_pyarrow(Not(bound_delete_filter))
+            preserve_row_filter = _expression_to_complementary_pyarrow(bound_delete_filter)
 
             files = self._scan(row_filter=delete_filter).plan_files()
 

tests/integration/test_deletes.py

@@ -27,7 +27,7 @@
 from pyiceberg.manifest import ManifestEntryStatus
 from pyiceberg.schema import Schema
 from pyiceberg.table.snapshots import Operation, Summary
-from pyiceberg.types import IntegerType, NestedField
+from pyiceberg.types import FloatType, IntegerType, NestedField
 
 
 def run_spark_commands(spark: SparkSession, sqls: List[str]) -> None:
@@ -105,6 +105,41 @@ def test_partitioned_table_rewrite(spark: SparkSession, session_catalog: RestCat
     assert tbl.scan().to_arrow().to_pydict() == {"number_partitioned": [11, 10], "number": [30, 30]}
 
 
+@pytest.mark.integration
+@pytest.mark.parametrize("format_version", [1, 2])
+def test_rewrite_partitioned_table_with_null(spark: SparkSession, session_catalog: RestCatalog, format_version: int) -> None:
+    identifier = "default.table_partitioned_delete"
+
+    run_spark_commands(
+        spark,
+        [
+            f"DROP TABLE IF EXISTS {identifier}",
+            f"""
+            CREATE TABLE {identifier} (
+                number_partitioned  int,
+                number              int
+            )
+            USING iceberg
+            PARTITIONED BY (number_partitioned)
+            TBLPROPERTIES('format-version' = {format_version})
+        """,
+            f"""
+            INSERT INTO {identifier} VALUES (10, 20), (10, 30)
+        """,
+            f"""
+            INSERT INTO {identifier} VALUES (11, 20), (11, NULL)
+        """,
+        ],
+    )
+
+    tbl = session_catalog.load_table(identifier)
+    tbl.delete(EqualTo("number", 20))
+
+    # We don't delete a whole partition, so there is only a overwrite
+    assert [snapshot.summary.operation.value for snapshot in tbl.snapshots()] == ["append", "append", "overwrite"]
+    assert tbl.scan().to_arrow().to_pydict() == {"number_partitioned": [11, 10], "number": [None, 30]}
+
+
 @pytest.mark.integration
 @pytest.mark.parametrize("format_version", [1, 2])
 def test_partitioned_table_no_match(spark: SparkSession, session_catalog: RestCatalog, format_version: int) -> None:
@@ -417,3 +452,107 @@ def test_delete_truncate(session_catalog: RestCatalog) -> None:
     assert len(entries) == 1
 
     assert entries[0].status == ManifestEntryStatus.DELETED
+
+
+@pytest.mark.integration
+def test_delete_overwrite_table_with_null(session_catalog: RestCatalog) -> None:
+    arrow_schema = pa.schema([pa.field("ints", pa.int32())])
+    arrow_tbl = pa.Table.from_pylist(
+        [{"ints": 1}, {"ints": 2}, {"ints": None}],
+        schema=arrow_schema,
+    )
+
+    iceberg_schema = Schema(NestedField(1, "ints", IntegerType()))
+
+    tbl_identifier = "default.test_delete_overwrite_with_null"
+
+    try:
+        session_catalog.drop_table(tbl_identifier)
+    except NoSuchTableError:
+        pass
+
+    tbl = session_catalog.create_table(tbl_identifier, iceberg_schema)
+    tbl.append(arrow_tbl)
+
+    assert [snapshot.summary.operation for snapshot in tbl.snapshots()] == [Operation.APPEND]
+
+    arrow_tbl_overwrite = pa.Table.from_pylist(
+        [
+            {"ints": 3},
+            {"ints": 4},
+        ],
+        schema=arrow_schema,
+    )
+    tbl.overwrite(arrow_tbl_overwrite, "ints == 2")  # Should rewrite one file
+
+    assert [snapshot.summary.operation for snapshot in tbl.snapshots()] == [
+        Operation.APPEND,
+        Operation.OVERWRITE,
+        Operation.APPEND,
+    ]
+
+    assert tbl.scan().to_arrow()["ints"].to_pylist() == [3, 4, 1, None]
+
+
+@pytest.mark.integration
+def test_delete_overwrite_table_with_nan(session_catalog: RestCatalog) -> None:
+    arrow_schema = pa.schema([pa.field("floats", pa.float32())])
+
+    # Create Arrow Table with NaN values
+    data = [pa.array([1.0, float("nan"), 2.0], type=pa.float32())]
+    arrow_tbl = pa.Table.from_arrays(
+        data,
+        schema=arrow_schema,
+    )
+
+    iceberg_schema = Schema(NestedField(1, "floats", FloatType()))
+
+    tbl_identifier = "default.test_delete_overwrite_with_nan"
+
+    try:
+        session_catalog.drop_table(tbl_identifier)
+    except NoSuchTableError:
+        pass
+
+    tbl = session_catalog.create_table(tbl_identifier, iceberg_schema)
+    tbl.append(arrow_tbl)
+
+    assert [snapshot.summary.operation for snapshot in tbl.snapshots()] == [Operation.APPEND]
+
+    arrow_tbl_overwrite = pa.Table.from_pylist(
+        [
+            {"floats": 3.0},
+            {"floats": 4.0},
+        ],
+        schema=arrow_schema,
+    )
+    """
+    We want to test the _expression_to_complementary_pyarrow function can generate a correct complimentary filter
+    for selecting records to remain in the new overwritten file.
+    Compared with test_delete_overwrite_table_with_null which tests rows with null cells,
+    nan testing is faced with a more tricky issue:
+    A filter of (field == value) will not include cells of nan but col != val will.
+    (Interestingly, neither == or != will include null)
+
+    This means if we set the test case as floats == 2.0 (equal predicate as in test_delete_overwrite_table_with_null),
+    test will pass even without the logic under test
+    in _NullNaNUnmentionedTermsCollector (a helper of _expression_to_complementary_pyarrow
+    to handle revert of iceberg expression of is_null/not_null/is_nan/not_nan).
+    Instead, we test the filter of !=, so that the revert is == which exposes the issue.
+    """
+    tbl.overwrite(arrow_tbl_overwrite, "floats != 2.0")  # Should rewrite one file
+
+    assert [snapshot.summary.operation for snapshot in tbl.snapshots()] == [
+        Operation.APPEND,
+        Operation.OVERWRITE,
+        Operation.APPEND,
+    ]
+
+    result = tbl.scan().to_arrow()["floats"].to_pylist()
+
+    from math import isnan
+
+    assert any(isnan(e) for e in result)
+    assert 2.0 in result
+    assert 3.0 in result
+    assert 4.0 in result

tests/io/test_pyarrow.py

@@ -15,7 +15,6 @@
 # specific language governing permissions and limitations
 # under the License.
 # pylint: disable=protected-access,unused-argument,redefined-outer-name
-
 import os
 import tempfile
 import uuid