robertwb commented on a change in pull request #12426:
URL: https://github.com/apache/beam/pull/12426#discussion_r464554560
##########
File path: sdks/python/apache_beam/coders/coder_impl.py
##########
@@ -530,6 +530,88 @@ def estimate_size(self, unused_value, nested=False):
return 1
+class MapCoderImpl(StreamCoderImpl):
+ """For internal use only; no backwards-compatibility guarantees.
+
+ A coder for typing.Mapping objects."""
+ def __init__(
+ self,
+ key_coder, # type: CoderImpl
+ value_coder # type: CoderImpl
+ ):
+ self._key_coder = key_coder
+ self._value_coder = value_coder
+
+ def encode_to_stream(self, value, out, nested):
+ size = len(value)
+ out.write_bigendian_int32(size)
Review comment:
This is unfortunate. We can't change MapCoder because that would be
backwards incompatible (and users might have encoded Maps stored in states or
elsewhere), so I suppose we'll have to stick with this limitation.
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