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From: ChengXiangLi <git@git.apache.org>
To: issues@flink.incubator.apache.org
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Subject: [GitHub] flink pull request: [FLINK-3192] Add explain support to
 print ast ...
Content-Type: text/plain
Message-Id: <20160108061910.D49E1DFCB8@git1-us-west.apache.org>
Date: Fri,  8 Jan 2016 06:19:10 +0000 (UTC)

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

    https://github.com/apache/flink/pull/1477#discussion_r49161249
  
    --- Diff: flink-staging/flink-table/src/main/scala/org/apache/flink/api/table/Table.scala ---
    @@ -267,5 +271,24 @@ case class Table(private[flink] val operation: PlanNode) {
         this.copy(operation = UnionAll(operation, right.operation))
       }
     
    +  /**
    +   * Get the process of the sql parsing, print AST and physical execution plan.The AST
    +   * show the structure of the supplied statement. The execution plan shows how the table 
    +   * referenced by the statement will be scanned.
    +   */
    +  def explain(extended: Boolean): String = {
    +    val ast = operation
    +    val dataSet = this.toDataSet[Row]
    +    val env = dataSet.getExecutionEnvironment
    +    dataSet.output(new DiscardingOutputFormat[Row])
    +    val string = env.getExecutionPlan()
    --- End diff --
    
    It's better to use some meaningful variable name here.


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