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https://issues.apache.org/jira/browse/FLINK-8866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534333#comment-16534333
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ASF GitHub Bot commented on FLINK-8866:
---------------------------------------

Github user walterddr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6201#discussion_r200523824
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/schema/TableSourceSinkTable.scala
 ---
    @@ -0,0 +1,43 @@
    +/*
    + * 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.
    + */
    +
    +package org.apache.flink.table.plan.schema
    +
    +import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeFactory}
    +import org.apache.calcite.schema.Statistic
    +import org.apache.calcite.schema.impl.AbstractTable
    +
    +class TableSourceSinkTable[T1, T2](val tableSourceTableOpt: 
Option[TableSourceTable[T1]],
    --- End diff --
    
    Huge +1. My understanding is this will be the overall class to hold a table 
source, sink or both. `TableSourceSinkTable` seems redundant. 


> Create unified interfaces to configure and instatiate TableSinks
> ----------------------------------------------------------------
>
>                 Key: FLINK-8866
>                 URL: https://issues.apache.org/jira/browse/FLINK-8866
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Shuyi Chen
>            Priority: Major
>              Labels: pull-request-available
>
> Similar to the efforts done in FLINK-8240. We need unified ways to configure 
> and instantiate TableSinks. Among other applications, this is necessary in 
> order to declare table sinks in an environment file of the SQL client. Such 
> that the sink can be used for {{INSERT INTO}} statements.
> Below are a few major changes in mind. 
> 1) Add TableSinkFactory/TableSinkFactoryService similar to 
> TableSourceFactory/TableSourceFactoryService
> 2) Add a common property called "type" with values (source, sink and both) 
> for both TableSource and TableSink.
> 3) in yaml file, replace "sources" with "tables", and use tableType to 
> identify whether it's source or sink.



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