#2147

opteryx/compiled/structures/__init__.py

@@ -1,6 +1,9 @@
 from .hash_table import HashSet
 from .hash_table import HashTable
+from .hash_table import anti_join
 from .hash_table import distinct
+from .hash_table import filter_join_set
 from .hash_table import list_distinct
+from .hash_table import semi_join
 from .memory_pool import MemoryPool
 from .node import Node

opteryx/compiled/structures/hash_table.pyx

@@ -72,9 +72,7 @@ cdef inline object recast_column(column):
 
 
 
-@cython.boundscheck(False)
 @cython.wraparound(False)
-@cython.cdivision(True)
 cpdef tuple distinct(table, HashSet seen_hashes=None, list columns=None):
     """
     Perform a distinct operation on the given table using an external HashSet.
@@ -142,9 +140,8 @@ cpdef tuple distinct(table, HashSet seen_hashes=None, list columns=None):
 
     return keep, seen_hashes
 
-@cython.boundscheck(False)
 @cython.wraparound(False)
-cdef void compute_float_hashes(cnp.ndarray[cnp.float64_t] data, int64_t null_hash, cnp.ndarray[int64_t] hashes):
+cdef void compute_float_hashes(cnp.ndarray[cnp.float64_t] data, int64_t null_hash, int64_t[:] hashes):
     cdef Py_ssize_t i, n = data.shape[0]
     cdef cnp.float64_t value
     for i in range(n):
@@ -154,9 +151,8 @@ cdef void compute_float_hashes(cnp.ndarray[cnp.float64_t] data, int64_t null_has
         else:
             hashes[i] = hash(value)
 
-@cython.boundscheck(False)
 @cython.wraparound(False)
-cdef void compute_int_hashes(cnp.ndarray[cnp.int64_t] data, int64_t null_hash, cnp.ndarray[int64_t] hashes):
+cdef void compute_int_hashes(cnp.ndarray[cnp.int64_t] data, int64_t null_hash, int64_t[:] hashes):
     cdef Py_ssize_t i, n = data.shape[0]
     cdef cnp.int64_t value
     for i in range(n):
@@ -168,9 +164,8 @@ cdef void compute_int_hashes(cnp.ndarray[cnp.int64_t] data, int64_t null_hash, c
         else:
             hashes[i] = value  # Hash of int is the int itself in Python 3
 
-@cython.boundscheck(False)
 @cython.wraparound(False)
-cdef void compute_object_hashes(cnp.ndarray data, int64_t null_hash, cnp.ndarray[int64_t] hashes):
+cdef void compute_object_hashes(cnp.ndarray data, int64_t null_hash, int64_t[:] hashes):
     cdef Py_ssize_t i, n = data.shape[0]
     cdef object value
     for i in range(n):
@@ -209,7 +204,6 @@ cpdef tuple list_distinct(cnp.ndarray values, cnp.int32_t[::1] indices, HashSet
 
 
 
-@cython.boundscheck(False)
 @cython.wraparound(False)
 cpdef HashTable hash_join_map(relation, list join_columns):
     """
@@ -276,3 +270,94 @@ cpdef HashTable hash_join_map(relation, list join_columns):
             ht.insert(hash_value, non_null_indices[i])
 
     return ht
+
+
+cpdef filter_join_set(relation, list join_columns, HashSet seen_hashes):
+
+    cdef int64_t num_columns = len(join_columns)
+
+    if seen_hashes is None:
+        seen_hashes = HashSet()
+
+    # Memory view for the values array (for the join columns)
+    cdef object[:, ::1] values_array = numpy.array(list(relation.select(join_columns).drop_null().itercolumns()), dtype=object)
+
+    cdef int64_t hash_value, i
+
+    if num_columns == 1:
+        col = values_array[0, :]
+        for i in range(len(col)):
+            hash_value = <int64_t>hash(col[i])
+            seen_hashes.insert(hash_value)
+    else:
+        for i in range(values_array.shape[1]):
+            # Combine the hashes of each value in the row
+            hash_value = 0
+            for value in values_array[:, i]:
+                hash_value = <int64_t>(hash_value * 31 + hash(value))
+            seen_hashes.insert(hash_value)
+
+    return seen_hashes
+
+cpdef anti_join(relation, list join_columns, HashSet seen_hashes):
+    cdef int64_t num_columns = len(join_columns)
+    cdef int64_t num_rows = relation.shape[0]
+    cdef int64_t hash_value, i
+    cdef cnp.ndarray[int64_t, ndim=1] index_buffer = numpy.empty(num_rows, dtype=numpy.int64)
+    cdef int64_t idx_count = 0
+
+    cdef object[:, ::1] values_array = numpy.array(list(relation.select(join_columns).drop_null().itercolumns()), dtype=object)
+
+    if num_columns == 1:
+        col = values_array[0, :]
+        for i in range(len(col)):
+            hash_value = <int64_t>hash(col[i])
+            if not seen_hashes.contains(hash_value):
+                index_buffer[idx_count] = i
+                idx_count += 1
+    else:
+        for i in range(values_array.shape[1]):
+            # Combine the hashes of each value in the row
+            hash_value = 0
+            for value in values_array[:, i]:
+                hash_value = <int64_t>(hash_value * 31 + hash(value))
+            if not seen_hashes.contains(hash_value):
+                index_buffer[idx_count] = i
+                idx_count += 1
+
+    if idx_count > 0:
+        return relation.take(index_buffer[:idx_count])
+    else:
+        return relation.slice(0, 0)
+
+
+cpdef semi_join(relation, list join_columns, HashSet seen_hashes):
+    cdef int64_t num_columns = len(join_columns)
+    cdef int64_t num_rows = relation.shape[0]
+    cdef int64_t hash_value, i
+    cdef cnp.ndarray[int64_t, ndim=1] index_buffer = numpy.empty(num_rows, dtype=numpy.int64)
+    cdef int64_t idx_count = 0
+
+    cdef object[:, ::1] values_array = numpy.array(list(relation.select(join_columns).drop_null().itercolumns()), dtype=object)
+
+    if num_columns == 1:
+        col = values_array[0, :]
+        for i in range(len(col)):
+            hash_value = <int64_t>hash(col[i])
+            if seen_hashes.contains(hash_value):
+                index_buffer[idx_count] = i
+                idx_count += 1
+    else:
+        for i in range(values_array.shape[1]):
+            # Combine the hashes of each value in the row
+            hash_value = 0
+            for value in values_array[:, i]:
+                hash_value = <int64_t>(hash_value * 31 + hash(value))
+            if seen_hashes.contains(hash_value):
+                index_buffer[idx_count] = i
+                idx_count += 1
+
+    if idx_count > 0:
+        return relation.take(index_buffer[:idx_count])
+    else:
+        return relation.slice(0, 0)

opteryx/operators/filter_join_node.py

@@ -13,78 +13,17 @@
 presence or absence of matching rows in the right table.
 """
 
-from typing import List
-from typing import Set
-
 import pyarrow
 
 from opteryx import EOS
+from opteryx.compiled.structures import anti_join
+from opteryx.compiled.structures import filter_join_set
+from opteryx.compiled.structures import semi_join
 from opteryx.models import QueryProperties
 
 from . import JoinNode
 
 
-def left_anti_join(left_relation, left_columns: List[str], right_hash_set: Set[str]):
-    """
-    Perform a LEFT ANTI JOIN.
-
-    This implementation ensures that all rows from the left table are included in the result set,
-    where there are no matching rows in the right table based on the join columns.
-
-    Parameters:
-        left_relation (pyarrow.Table): The left pyarrow.Table to join.
-        left_columns (list of str): Column names from the left table to join on.
-        right_hash_set (set of tuple): A set of tuples representing the hashed values of the right table's join columns.
-
-    Returns:
-        A pyarrow.Table containing the result of the LEFT ANTI JOIN operation.
-    """
-
-    left_indexes = []
-    left_values = left_relation.select(left_columns).drop_null().itercolumns()
-    for i, value_tuple in enumerate(map(hash, zip(*left_values))):
-        if (
-            value_tuple not in right_hash_set
-        ):  # Only include left rows that have no match in the right table
-            left_indexes.append(i)
-
-    # Filter the left_chunk based on the anti join condition
-    if left_indexes:
-        return left_relation.take(left_indexes)
-    else:
-        return left_relation.slice(0, 0)
-
-
-def left_semi_join(left_relation, left_columns: List[str], right_hash_set: Set[str]):
-    """
-    Perform a LEFT SEMI JOIN.
-
-    This implementation ensures that all rows from the left table that have a matching row in the right table
-    based on the join columns are included in the result set.
-
-    Parameters:
-        left_relation (pyarrow.Table): The left pyarrow.Table to join.
-        left_columns (list of str): Column names from the left table to join on.
-        right_hash_set (set of tuple): A set of tuples representing the hashed values of the right table's join columns.
-
-    Returns:
-        A pyarrow.Table containing the result of the LEFT ANTI JOIN operation.
-    """
-    left_indexes = []
-    left_values = left_relation.select(left_columns).drop_null().itercolumns()
-    for i, value_tuple in enumerate(map(hash, zip(*left_values))):
-        if (
-            value_tuple in right_hash_set
-        ):  # Only include left rows that have a match in the right table
-            left_indexes.append(i)
-
-    # Filter the left_chunk based on the semi join condition
-    if left_indexes:
-        return left_relation.take(left_indexes)
-    else:
-        return left_relation.slice(0, 0)
-
-
 class FilterJoinNode(JoinNode):
     def __init__(self, properties: QueryProperties, **parameters):
         JoinNode.__init__(self, properties=properties, **parameters)
@@ -98,16 +37,15 @@ def __init__(self, properties: QueryProperties, **parameters):
         self.right_columns = parameters.get("right_columns")
         self.right_readers = parameters.get("right_readers")
 
-        self.right_buffer = []
-        self.right_hash_set = set()
+        self.right_hash_set = None
 
     @classmethod
     def from_json(cls, json_obj: str) -> "BasePlanNode":  # pragma: no cover
         raise NotImplementedError()
 
     @property
     def name(self):  # pragma: no cover
-        return self.join_type
+        return self.join_type.replace(" ", "_")
 
     @property
     def config(self) -> str:  # pragma: no cover
@@ -126,24 +64,16 @@ def execute(self, morsel: pyarrow.Table, join_leg: str) -> pyarrow.Table:
             else:
                 join_provider = providers.get(self.join_type)
                 yield join_provider(
-                    left_relation=morsel,
-                    left_columns=self.left_columns,
-                    right_hash_set=self.right_hash_set,
-                )
-        if join_leg == "right":
-            if morsel == EOS:
-                right_relation = pyarrow.concat_tables(self.right_buffer, promote_options="none")
-                self.right_buffer.clear()
-                non_null_right_values = (
-                    right_relation.select(self.right_columns).drop_null().itercolumns()
+                    relation=morsel,
+                    join_columns=self.left_columns,
+                    seen_hashes=self.right_hash_set,
                 )
-                self.right_hash_set = set(map(hash, zip(*non_null_right_values)))
-            else:
-                self.right_buffer.append(morsel)
-                yield None
+        if join_leg == "right" and morsel != EOS:
+            self.right_hash_set = filter_join_set(morsel, self.right_columns, self.right_hash_set)
+            yield None
 
 
 providers = {
-    "left anti": left_anti_join,
-    "left semi": left_semi_join,
+    "left anti": anti_join,
+    "left semi": semi_join,
 }