dianfu commented on a change in pull request #9858: [FLINK-14208][python]
Optimize Python UDFs with parameters of constant values
URL: https://github.com/apache/flink/pull/9858#discussion_r333376429
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File path: flink-python/pyflink/fn_execution/operations.py
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@@ -79,6 +82,53 @@ def get(self, value):
return self.scalar_function_invoker.invoke_eval(value)
+class ConstantInputGetter(InputGetter):
+ """
+ InputGetter for the input argument which is a constant value.
+
+ :param constant_value: the constant value of the column
+ """
+
+ def __init__(self, constant_value):
+ j_type = constant_value[0]
+ serializer = PickleSerializer()
+ pickled_data = serializer.loads(constant_value[1:])
+ # the type set contains
+ #
TINYINT,SMALLINT,INTEGER,BIGINT,FLOAT,DOUBLE,DECIMAL,CHAR,VARCHAR,NULL
+ # the pickled_data doesn't need to transfer to anther python object
+ if j_type == '\x00' or j_type == 0:
+ self._constant_value = pickled_data
+ # the type is BOOLEAN
+ elif j_type == '\x01' or j_type == 1:
+ self._constant_value = True if pickled_data == 'true' else False
+ # the type is DATE
+ elif j_type == '\x02' or j_type == 2:
+ self._constant_value = \
+ datetime.date(year=1970, month=1, day=1) +
datetime.timedelta(days=pickled_data)
+ # the type is TIME
+ elif j_type == '\x03' or j_type == 3:
+ seconds, milliseconds = divmod(pickled_data, 1000)
+ minutes, seconds = divmod(seconds, 60)
+ hours, minutes = divmod(minutes, 60)
+ self._constant_value = datetime.time(hours, minutes, seconds,
milliseconds * 1000)
+ # the type set contains TIMESTAMP
+ elif j_type == '\x04' or j_type == 4:
+ self._constant_value = \
+ datetime.datetime(year=1970, month=1, day=1, hour=0, minute=0,
second=0) \
+ + datetime.timedelta(milliseconds=pickled_data)
+ # the type set is YEAR_INTERVAL_TYPES
+ elif j_type == '\x05' or j_type == 5:
+ self._constant_value = relativedelta(months=pickled_data)
+ # the type set is DAY_INTERVAL_TYPES
+ elif j_type == '\x06' or j_type == 6:
+ self._constant_value =
datetime.timedelta(milliseconds=pickled_data)
+ else:
+ raise Exception("Unknown type %s, it may be encode/decode error" %
str(j_type))
Review comment:
Unknown type %s, should never happen
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