Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8909#discussion_r41424269
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -64,18 +63,28 @@ import org.apache.spark.util.Utils
*
* @since 1.0.0
*/
-class SQLContext(@transient val sparkContext: SparkContext)
- extends org.apache.spark.Logging
- with Serializable {
+class SQLContext private[sql](
+ @transient val sparkContext: SparkContext,
+ @transient protected[sql] val cacheManager: CacheManager)
+ extends org.apache.spark.Logging with Serializable {
self =>
+ def this(sparkContext: SparkContext) = this(sparkContext, new
CacheManager)
def this(sparkContext: JavaSparkContext) = this(sparkContext.sc)
/**
+ * Returns a SQLContext as new session, with separated SQL
configurations, temporary tables,
+ * registered functions, but share the same SparkContext and
CacheManager.
+ */
+ def newSession(): SQLContext = {
+ new SQLContext(sparkContext, cacheManager)
+ }
+
+ /**
* @return Spark SQL configuration
*/
- protected[sql] def conf = currentSession().conf
+ protected[sql] lazy val conf = new SQLConf
--- End diff --
Can we avoid of using `lazy val`?
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