Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18172#discussion_r119549608
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -899,21 +899,15 @@ object SparkSession {
// No active nor global default session. Create a new one.
val sparkContext = userSuppliedContext.getOrElse {
+ val sparkConf = new SparkConf()
+ SparkContext.getOrCreate(sparkConf)
--- End diff --
Empty `SparkConf` lacking necessary setting such as `spark.master` causes
failure.
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