Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21990#discussion_r224984813
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -86,6 +86,7 @@ class SparkSession private(
private[sql] def this(sc: SparkContext) {
this(sc, None, None, new SparkSessionExtensions)
+ SparkSession.applyExtensionsFromConf(sc.getConf, this.extensions)
--- End diff --
Let's add some comments why this is only here in this constructor. It might
look weird why this constructor specifically requires to run
`applyExtensionsFromConf` alone.
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