maropu commented on a change in pull request #28852:
URL: https://github.com/apache/spark/pull/28852#discussion_r446509229



##########
File path: 
sql/hive/src/test/scala/org/apache/spark/sql/hive/HiveMetadataCacheSuite.scala
##########
@@ -126,4 +129,39 @@ class HiveMetadataCacheSuite extends QueryTest with 
SQLTestUtils with TestHiveSi
   for (pruningEnabled <- Seq(true, false)) {
     testCaching(pruningEnabled)
   }
+
+  test("cache TTL") {
+    val sparkConfWithTTl = new SparkConf().set(SQLConf.METADATA_CACHE_TTL.key, 
"1")
+    val newSession = 
SparkSession.builder.config(sparkConfWithTTl).getOrCreate().cloneSession()
+
+    withSparkSession(newSession) { implicit spark =>

Review comment:
       How about creating `SQLContext` by yourself like this? 
https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/SparkSessionBuilderSuite.scala#L114-L115




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