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From sunjincheng121 <...@git.apache.org>
Subject [GitHub] flink pull request #4199: [FLINK-6584] [table] Support multiple consecutive ...
Date Tue, 27 Jun 2017 17:44:43 GMT
Github user sunjincheng121 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4199#discussion_r124341520
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/common/WindowStartEndPropertiesRule.scala
---
    @@ -54,34 +56,75 @@ class WindowStartEndPropertiesRule
         val project = call.rel(0).asInstanceOf[LogicalProject]
         val innerProject = call.rel(1).asInstanceOf[LogicalProject]
         val agg = call.rel(2).asInstanceOf[LogicalWindowAggregate]
    +    val window = agg.getWindow
     
    -    // Retrieve window start and end properties
    +    val isRowtime = isRowtimeAttribute(window.timeAttribute)
    +    val isProctime = isProctimeAttribute(window.timeAttribute)
    +
    +    val startEndProperties = Seq(
    +      NamedWindowProperty("w$start", WindowStart(window.aliasAttribute)),
    +      NamedWindowProperty("w$end", WindowEnd(window.aliasAttribute)))
    +
    +    // allow rowtime/proctime for rowtime windows and proctime for proctime windows
    +    val timeProperties = if (isRowtime) {
    +      Seq(
    +        NamedWindowProperty("w$rowtime", RowtimeAttribute(window.aliasAttribute)),
    +        NamedWindowProperty("w$proctime", ProctimeAttribute(window.aliasAttribute)))
    --- End diff --
    
    Why rowtime windows need the proctime property?


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