fix: yield partitions for unique stream slices in StreamSlicerPartitionGenerator (#508)

Co-authored-by: octavia-squidington-iii <[email protected]>

Author: lazebnyi

airbyte_cdk/sources/declarative/stream_slicers/declarative_partition_generator.py

@@ -1,6 +1,6 @@
 # Copyright (c) 2024 Airbyte, Inc., all rights reserved.
 
-from typing import Any, Iterable, Mapping, Optional
+from typing import Any, Hashable, Iterable, Mapping, Optional
 
 from airbyte_cdk.sources.declarative.retrievers import Retriever
 from airbyte_cdk.sources.message import MessageRepository
@@ -89,5 +89,21 @@ def __init__(
         self._stream_slicer = stream_slicer
 
     def generate(self) -> Iterable[Partition]:
+        # Yield partitions for unique stream slices, avoiding duplicates
+        seen_slices: set[Hashable] = set()
         for stream_slice in self._stream_slicer.stream_slices():
+            slice_key = self._make_hashable(stream_slice)
+            if slice_key in seen_slices:
+                continue
+            seen_slices.add(slice_key)
             yield self._partition_factory.create(stream_slice)
+
+    @staticmethod
+    def _make_hashable(obj: Any) -> Any:
+        if isinstance(obj, dict):
+            return frozenset(
+                (k, StreamSlicerPartitionGenerator._make_hashable(v)) for k, v in obj.items()
+            )
+        if isinstance(obj, list):
+            return tuple(StreamSlicerPartitionGenerator._make_hashable(i) for i in obj)
+        return obj