Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21990#discussion_r225077270
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -1136,4 +1121,27 @@ object SparkSession extends Logging {
SparkSession.clearDefaultSession()
}
}
+
+ /**
+ * Initialize extensions if the user has defined a configurator class in
their SparkConf.
+ * This class will be applied to the extensions passed into this
function.
+ */
+ private[sql] def applyExtensionsFromConf(conf: SparkConf, extensions:
SparkSessionExtensions) {
--- End diff --
How about returning `SparkSessionExtensions` from this method, and
modifying the secondary constructor of `SparkSession` as:
```scala
private[sql] def this(sc: SparkContext) {
this(sc, None, None,
SparkSession.applyExtensionsFromConf(sc.getConf, new
SparkSessionExtensions))
}
```
I'm a little worried whether the order we apply extensions might affect.
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