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#
# Copyright 2011 Twitter, Inc.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Example demonstrating the use of predefined subassemblies.
Useful aggregators, subassemblies, pipes available in Cascading are imported
into PyCascading by native.py
"""
from pycascading.helpers import *
def main():
flow = Flow()
repeats = flow.source(Hfs(TextDelimited(Fields(['col1', 'col2']), ' ',
[String, Integer]),
'pycascading_data/repeats.txt'))
output = flow.tsv_sink('pycascading_data/out')
# This selects the distinct records considering all fields
repeats | native.unique(Fields.ALL) | output
flow.run()
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