feat(pyamber): hash epoch timestamps on Windows

amber/src/main/python/core/models/tuple.py

@@ -24,6 +24,7 @@
 import typing
 from collections import OrderedDict
 from copy import deepcopy as _deepcopy
+from dateutil.tz import tzlocal
 from loguru import logger
 from pandas._libs.missing import checknull
 from pympler import asizeof
@@ -472,7 +473,9 @@ def __hash__(self) -> int:
             AttributeType.LONG: lambda f: java_hash_long(f),
             AttributeType.DOUBLE: lambda f: java_hash_long(double_to_long(f)),
             AttributeType.STRING: lambda f: java_hash_bytes(map(ord, f), 0, salt),
-            AttributeType.TIMESTAMP: lambda f: java_hash_long(int(f.timestamp())),
+            AttributeType.TIMESTAMP: lambda f: java_hash_long(
+                int((f if f.tzinfo else f.replace(tzinfo=tzlocal())).timestamp())
+            ),
             AttributeType.BINARY: lambda f: java_hash_bytes(f, 1, salt),
         }
 

amber/src/test/python/core/models/test_tuple.py

@@ -540,7 +540,10 @@ def test_hash(self):
                 "col-bool": True,
                 "col-long": -8965536434247,
                 "col-double": 1 / 3,
-                "col-timestamp": datetime.datetime.fromtimestamp(-1990),
+                "col-timestamp": datetime.datetime(
+                    1970, 1, 1, tzinfo=datetime.timezone.utc
+                )
+                - datetime.timedelta(seconds=1990),
                 "col-binary": None,
             },
             schema,
@@ -561,6 +564,14 @@ def test_hash(self):
         )
         assert hash(tuple5) == -2099556631  # calculated with Java
 
+    def test_hash_supports_local_epoch_timestamp(self):
+        tuple_ = Tuple(
+            {"value": datetime.datetime.fromtimestamp(0)},
+            Schema(raw_schema={"value": "TIMESTAMP"}),
+        )
+
+        assert hash(tuple_) == 31
+
     def test_tuple_with_large_binary(self):
         """Test tuple with largebinary field."""
         from core.models.type.large_binary import largebinary