Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18172#discussion_r119645957
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -753,6 +753,8 @@ object SparkSession {
private[this] val options = new
scala.collection.mutable.HashMap[String, String]
+ private[this] var master: Option[String] = None
--- End diff --
`master` is only useful when creating a new `SparkContext`, so here I
separate it from `options` and only use it when creating new `SparkContext`
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