dianfu commented on a change in pull request #9977: [FLINK-14497][python]
Support primitive data types in Python user-defined functions
URL: https://github.com/apache/flink/pull/9977#discussion_r338916249
##########
File path: flink-python/pyflink/fn_execution/coder_impl.py
##########
@@ -74,3 +77,109 @@ def read_null_mask(field_count, in_stream):
def __repr__(self):
return 'RowCoderImpl[%s]' % ', '.join(str(c) for c in
self._field_coders)
+
+
+class LongCoderImpl(StreamCoderImpl):
+ def encode_to_stream(self, value, out_stream, nested):
+ out_stream.write_bigendian_int64(value)
+
+ def decode_from_stream(self, in_stream, nested):
+ return in_stream.read_bigendian_int64()
+
+
+class ByteCoderImpl(StreamCoderImpl):
+
+ def encode_to_stream(self, value, out_stream, nested):
+ out_stream.write_byte(value)
+
+ def decode_from_stream(self, in_stream, nested):
+ return int(in_stream.read_byte())
+
+
+class ShortCoderImpl(StreamCoderImpl):
+
+ def encode_to_stream(self, value, out_stream, nested):
+ out_stream.write(struct.pack('>h', value))
+
+ def decode_from_stream(self, in_stream, nested):
+ return struct.unpack('>h', in_stream.read(2))[0]
+
+
+class IntCoderImpl(StreamCoderImpl):
+ def encode_to_stream(self, value, out_stream, nested):
+ out_stream.write_bigendian_int32(value)
+
+ def decode_from_stream(self, in_stream, nested):
+ return in_stream.read_bigendian_int32()
+
+
+class BooleanCoderImpl(StreamCoderImpl):
+
+ def encode_to_stream(self, value, out_stream, nested):
+ out_stream.write_byte(value)
+
+ def decode_from_stream(self, in_stream, nested):
+ return not not in_stream.read_byte()
+
+
+class FloatCoderImpl(StreamCoderImpl):
+
+ def encode_to_stream(self, value, out_stream, nested):
+ out_stream.write(struct.pack('>f', value))
+
+ def decode_from_stream(self, in_stream, nested):
+ return struct.unpack('>f', in_stream.read(4))[0]
+
+
+class DoubleCoderImpl(StreamCoderImpl):
+
+ def encode_to_stream(self, value, out_stream, nested):
+ out_stream.write_bigendian_double(value)
+
+ def decode_from_stream(self, in_stream, nested):
+ return in_stream.read_bigendian_double()
+
+
+class BinaryCoderImpl(StreamCoderImpl):
+
+ def encode_to_stream(self, value, out_stream, nested):
+ if value is None:
+ raise ValueError("Serialized byte array value should not be None")
+ out_stream.write_bigendian_int32(len(value))
+ out_stream.write(value, False)
+
+ def decode_from_stream(self, in_stream, nested):
+ size = in_stream.read_bigendian_int32()
+ return in_stream.read(size)
+
+
+class StringCoderImpl(StreamCoderImpl):
+
+ def encode_to_stream(self, value, out_stream, nested):
+ if value is None:
Review comment:
Remove the null check
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