Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14897#discussion_r82517462
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SharedState.scala ---
@@ -94,6 +69,47 @@ private[sql] class SharedState(val sparkContext:
SparkContext) extends Logging {
}
/**
+ * Class for caching query results reused in future executions.
+ */
+ val cacheManager: CacheManager = new CacheManager
+
+ /**
+ * A listener for SQL-specific
[[org.apache.spark.scheduler.SparkListenerEvent]]s.
+ */
+ val listener: SQLListener = createListenerAndUI(sparkContext)
+
+ /**
+ * A catalog that interacts with external systems.
+ */
+ val externalCatalog: ExternalCatalog =
+ SharedState.reflect[ExternalCatalog, SparkConf, Configuration](
+ SharedState.externalCatalogClassName(sparkContext.conf),
+ sparkContext.conf,
+ sparkContext.hadoopConfiguration)
+
+ /**
+ * A manager for global temporary views.
+ */
+ val globalTempViewManager = {
+ // System preserved database should not exists in metastore. However
it's hard to guarantee it
+ // for every session, because case-sensitivity differs. Here we always
lowercase it to make our
+ // life easier.
+ val globalTempDB =
sparkContext.conf.get(GLOBAL_TEMP_DATABASE).toLowerCase
+ if (externalCatalog.databaseExists(globalTempDB)) {
+ throw new SparkException(
+ s"$globalTempDB is a system preserved database, please rename your
existing database " +
+ "to resolve the name conflict and launch your Spark application
again.")
--- End diff --
In the offline discussion, we decided to hide this internal config to
users, did I miss something?
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