make tests work

Author: pcmoritz

cpp/src/arrow/python/arrow_to_python.cc

@@ -195,6 +195,7 @@ Status ReadSerializedPythonSequence(std::shared_ptr<io::RandomAccessFile> src,
   RETURN_NOT_OK(ipc::RecordBatchStreamReader::Open(src, &reader));
   RETURN_NOT_OK(reader->ReadNextRecordBatch(batch_out));
   RETURN_NOT_OK(src->Tell(&offset));
+  offset += 4; // TODO(pcm): Why is this neccessary?
   for (int i = 0; i < num_tensors; ++i) {
     std::shared_ptr<Tensor> tensor;
     RETURN_NOT_OK(ipc::ReadTensor(offset, src.get(), &tensor));

python/pyarrow/tests/test_serialization.py

@@ -168,19 +168,20 @@ class CustomError(Exception):
 pa.lib.register_type(Bar, 20 * b"\x02")
 pa.lib.register_type(Baz, 20 * b"\x03")
 pa.lib.register_type(Qux, 20 * b"\x04")
-pa.lib.register_type(Exception, 20 * b"\x05")
-pa.lib.register_type(CustomError, 20 * b"\x06")
-pa.lib.register_type(Point, 20 * b"\x07")
-pa.lib.register_type(NamedTupleExample, 20 * b"\x08")
+pa.lib.register_type(SubQux, 20 * b"\x05")
+pa.lib.register_type(Exception, 20 * b"\x06")
+pa.lib.register_type(CustomError, 20 * b"\x07")
+pa.lib.register_type(Point, 20 * b"\x08")
+pa.lib.register_type(NamedTupleExample, 20 * b"\x09")
 
 # TODO(pcm): This is currently a workaround until arrow supports
 # arbitrary precision integers. This is only called on long integers,
 # see the associated case in the append method in python_to_arrow.cc
-pa.lib.register_type(int, 20 * b"\x09", pickle=False,
+pa.lib.register_type(int, 20 * b"\x10", pickle=False,
     custom_serializer=lambda obj: str(obj),
     custom_deserializer=lambda serialized_obj: int(serialized_obj))
 if (sys.version_info < (3, 0)):
-    pa.lib.register_type(long, 20 * b"\x10", pickle=False,
+    pa.lib.register_type(long, 20 * b"\x11", pickle=False,
         custom_serializer=lambda obj: str(obj),
         custom_deserializer=lambda serialized_obj: long(serialized_obj))