Adding upstream version 0.12.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

stubs/pyarrow/lib.pyi

@@ -0,0 +1,32 @@
+from . import Date32Type, Date64Type, Scalar, TimestampType
+
+class ArrowException(Exception): ...
+class ArrowInvalid(ValueError, ArrowException): ...
+class ArrowMemoryError(MemoryError, ArrowException): ...
+class ArrowKeyError(KeyError, Exception): ...
+class ArrowTypeError(TypeError, Exception): ...
+class ArrowNotImplementedError(NotImplementedError, ArrowException): ...
+class ArrowCapacityError(ArrowException): ...
+class ArrowIndexError(IndexError, ArrowException): ...
+class ArrowSerializationError(ArrowException): ...
+class ArrowCancelled(ArrowException): ...
+
+ArrowIOError = IOError
+
+class Date32Scalar(Scalar):
+    @property
+    def type(self) -> Date32Type: ...
+    @property
+    def value(self) -> int: ...
+
+class Date64Scalar(Scalar):
+    @property
+    def type(self) -> Date64Type: ...
+    @property
+    def value(self) -> int: ...
+
+class TimestampScalar(Scalar):
+    @property
+    def type(self) -> TimestampType: ...
+    @property
+    def value(self) -> int: ...