Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1238#discussion_r15205473
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala ---
@@ -22,15 +22,21 @@ import java.util.Properties
import scala.collection.JavaConverters._
/**
- * SQLConf holds mutable config parameters and hints. These can be set and
- * queried either by passing SET commands into Spark SQL's DSL
- * functions (sql(), hql(), etc.), or by programmatically using setters and
- * getters of this class.
+ * A trait that enables the setting and getting of mutable config
parameters/hints. The central
+ * location for storing them is uniquely located in the same-name private
companion object.
+ * Therefore, all classes that mix in this trait share all the hints.
--- End diff --
Is this comment correct? I don't see a companion object.
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