sunjincheng121 commented on a change in pull request #8267: [FLINK-12311][table][python] Add base python framework and Add Scan, Projection, and Filter operator support URL: https://github.com/apache/flink/pull/8267#discussion_r279607459
########## File path: flink-python/pyflink/table/table_environment.py ########## @@ -0,0 +1,160 @@ +################################################################################ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you 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. +################################################################################ + +from abc import ABCMeta + +from pyflink.java_gateway import get_gateway +from pyflink.table import Table +from pyflink.util import type_utils, utils + +__all__ = [ + 'BatchTableEnvironment', + 'StreamTableEnvironment', + 'TableEnvironment' +] + + +class TableEnvironment(object): + """ + The abstract base class for batch and stream TableEnvironments. + """ + + __metaclass__ = ABCMeta + + def __init__(self, j_tenv): + self._j_tenv = j_tenv + + def from_table_source(self, table_source): + """ + Creates a table from a table source. + + :param table_source: table source used as table + :return: result table + """ + return Table(self._j_tenv.fromTableSource(table_source._j_table_source)) + + def register_table(self, name, table): + """ + Registers a :class:`Table` under a unique name in the TableEnvironment's catalog. + Registered tables can be referenced in SQL queries. + + :param name: The name under which the table will be registered. + :param table: The table to register. + """ + self._j_tenv.registerTable(name, table._java_table) + + def register_table_source(self, name, table_source): + """ + Registers an external :class:`TableSource` in this :class:`TableEnvironment`'s catalog. + Registered tables can be referenced in SQL queries. + + :param name: The name under which the :class:`TableSource` is registered. + :param table_source: The :class:`TableSource` to register. + """ + self._j_tenv.registerTableSource(name, table_source._j_table_source) + + def register_table_sink(self, name, field_names, field_types, table_sink): + """ + Registers an external :class:`TableSink` with given field names and types in this + :class:`TableEnvironment`\ 's catalog. Review comment: `TableEnvironment`\ 's catalog. -> `TableEnvironment`\'s catalog. ? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
