Source code for petastorm.etl
# Copyright (c) 2017-2018 Uber Technologies, 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.
import abc
import six
[docs]@six.add_metaclass(abc.ABCMeta)
class RowGroupIndexerBase(object):
""" Base class for row group indexers."""
@abc.abstractmethod
def __add__(self, other):
pass
@abc.abstractproperty
def index_name(self):
""" Return unique index name."""
return None
@abc.abstractproperty
def column_names(self):
""" Return list of column(s) reuired to build index."""
return None
@abc.abstractproperty
def indexed_values(self):
""" Return list of values in index"""
return None
[docs] @abc.abstractmethod
def get_row_group_indexes(self, value_key):
""" Return row groups for given value in index."""
return None
[docs] @abc.abstractmethod
def build_index(self, decoded_rows, piece_index):
""" index values in given rows."""