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https://issues.apache.org/jira/browse/FLINK-9059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420750#comment-16420750
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ASF GitHub Bot commented on FLINK-9059:
---------------------------------------

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

    https://github.com/apache/flink/pull/5758#discussion_r178334057
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/descriptors/TableDescriptor.scala
 ---
    @@ -0,0 +1,75 @@
    +/*
    + * 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.descriptors
    +
    +import org.apache.flink.table.descriptors.DescriptorProperties.toScala
    +import 
org.apache.flink.table.descriptors.StatisticsValidator.{STATISTICS_COLUMNS, 
STATISTICS_ROW_COUNT, readColumnStats}
    +import org.apache.flink.table.plan.stats.TableStats
    +
    +import scala.collection.JavaConverters._
    +
    +/**
    +  * Common class for all descriptors describing table sources and sinks.
    +  */
    +abstract class TableDescriptor extends Descriptor {
    +
    +  protected var connectorDescriptor: Option[ConnectorDescriptor] = None
    +  protected var formatDescriptor: Option[FormatDescriptor] = None
    +  protected var schemaDescriptor: Option[Schema] = None
    +  protected var statisticsDescriptor: Option[Statistics] = None
    +  protected var metaDescriptor: Option[Metadata] = None
    +
    +  /**
    +    * Internal method for properties conversion.
    +    */
    +  override private[flink] def addProperties(properties: 
DescriptorProperties): Unit = {
    +    connectorDescriptor.foreach(_.addProperties(properties))
    +    formatDescriptor.foreach(_.addProperties(properties))
    +    schemaDescriptor.foreach(_.addProperties(properties))
    +    metaDescriptor.foreach(_.addProperties(properties))
    +  }
    +
    +  /**
    +    * Reads table statistics from the descriptors properties.
    +    */
    +  protected def getTableStats: Option[TableStats] = {
    +    val normalizedProps = new DescriptorProperties()
    +    addProperties(normalizedProps)
    +    val rowCount = 
toScala(normalizedProps.getOptionalLong(STATISTICS_ROW_COUNT))
    +    rowCount match {
    +      case Some(cnt) =>
    +        val columnStats = readColumnStats(normalizedProps, 
STATISTICS_COLUMNS)
    +        Some(TableStats(cnt, columnStats.asJava))
    +      case None =>
    +        None
    +    }
    +  }
    +}
    +
    +object TableDescriptor {
    +  /**
    +    * Key for describing the type of this table, valid values are 
('source').
    +    */
    +  val TABLE_TYPE = "type"
    +
    +  /**
    +    * Valid TABLE_TYPE value.
    +    */
    +  val TABLE_TYPE_SOURCE = "source"
    --- End diff --
    
    make sense 👍 


> Add support for unified table source and sink declaration in environment file
> -----------------------------------------------------------------------------
>
>                 Key: FLINK-9059
>                 URL: https://issues.apache.org/jira/browse/FLINK-9059
>             Project: Flink
>          Issue Type: Task
>          Components: Table API & SQL
>            Reporter: Shuyi Chen
>            Assignee: Shuyi Chen
>            Priority: Major
>             Fix For: 1.5.0
>
>
> 1) Add a common property called "type" with single value 'source'.
> 2) in yaml file, replace "sources" with "tables".



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