NBL-19 Optimized cyclic bytes concatenation with bytearray

This closes #189

Author: dmelnichuk

pyignite/datatypes/complex.py

@@ -113,11 +113,11 @@ def from_python(cls, value):
             length = 1
         header.length = length
         setattr(header, cls.type_or_id_name, type_or_id)
-        buffer = bytes(header)
+        buffer = bytearray(header)
 
         for x in value:
             buffer += infer_from_python(x)
-        return buffer
+        return bytes(buffer)
 
 
 class WrappedDataObject(IgniteDataType):
@@ -294,12 +294,12 @@ def from_python(cls, value, type_id=None):
             )
         if hasattr(header, 'type'):
             header.type = type_id
-        buffer = bytes(header)
+        buffer = bytearray(header)
 
         for k, v in value.items():
             buffer += infer_from_python(k)
             buffer += infer_from_python(v)
-        return buffer
+        return bytes(buffer)
 
 
 class MapObject(Map):

pyignite/datatypes/internal.py

@@ -170,15 +170,15 @@ def from_python(self, value):
         header_class = self.build_header_class()
         header = header_class()
         header.length = length
-        buffer = bytes(header)
+        buffer = bytearray(header)
 
         for i, v in enumerate(value):
             for default_key, default_value in self.defaults.items():
                 v.setdefault(default_key, default_value)
             for name, el_class in self.following:
                 buffer += el_class.from_python(v[name])
 
-        return buffer
+        return bytes(buffer)
 
 
 @attr.s
@@ -472,8 +472,8 @@ def from_python(self, value):
             value = [value]
             length = 1
         header.length = length
-        buffer = bytes(header)
+        buffer = bytearray(header)
 
         for x in value:
             buffer += infer_from_python(x)
-        return buffer
+        return bytes(buffer)

pyignite/datatypes/primitive_arrays.py

@@ -97,11 +97,11 @@ def from_python(cls, value):
             )
         length = len(value)
         header.length = length
-        buffer = bytes(header)
+        buffer = bytearray(header)
 
         for x in value:
             buffer += cls.primitive_type.from_python(x)
-        return buffer
+        return bytes(buffer)
 
 
 class ByteArray(PrimitiveArray):

pyignite/datatypes/standard.py

@@ -643,11 +643,11 @@ def from_python(cls, value):
             )
         length = len(value)
         header.length = length
-        buffer = bytes(header)
+        buffer = bytearray(header)
 
         for x in value:
             buffer += cls.standard_type.from_python(x)
-        return buffer
+        return bytes(buffer)
 
 
 class StringArray(StandardArray):
@@ -807,11 +807,11 @@ def from_python(cls, value):
         length = len(value)
         header.length = length
         header.type_id = type_id
-        buffer = bytes(header)
+        buffer = bytearray(header)
 
         for x in value:
             buffer += cls.standard_type.from_python(x)
-        return buffer
+        return bytes(buffer)
 
     @classmethod
     def to_python(cls, ctype_object, *args, **kwargs):