[GitHub] spark pull request #16401: [SPARK-18998] [SQL] Add a cbo conf to switch betw...

[wzhfy <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/16401#discussion_r94279929
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -642,6 +642,13 @@ object SQLConf {
           .doubleConf
           .createWithDefault(0.05)
     
    +  val CBO_ENABLED =
    --- End diff --
    
    Although it seems to influence only how the plan stats are calculated, but that can lead to changes in output plans and thus execution procedure, so I think we can say it's meant for enabling the cbo framework.


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