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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