Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9058#discussion_r41801829
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -64,14 +64,37 @@ import org.apache.spark.util.Utils
*/
class SQLContext private[sql](
@transient val sparkContext: SparkContext,
- @transient protected[sql] val cacheManager: CacheManager)
+ @transient protected[sql] val cacheManager: CacheManager,
+ val isRootContext: Boolean)
extends org.apache.spark.Logging with Serializable {
self =>
- def this(sparkContext: SparkContext) = this(sparkContext, new
CacheManager)
+ def this(sparkContext: SparkContext) = this(sparkContext, new
CacheManager, true)
def this(sparkContext: JavaSparkContext) = this(sparkContext.sc)
+ // If spark.sql.allowMultipleContexts is true, we will throw an
exception if a user
+ // wants to create a new root SQLContext (a SLQContext that is not
created by newSession).
+ private val allowMultipleContexts =
+ sparkContext.conf.getBoolean(
+ SQLConf.ALLOW_MULTIPLE_CONTEXTS.key,
+ SQLConf.ALLOW_MULTIPLE_CONTEXTS.defaultValue.get)
--- End diff --
ah yes, SQLConf has not been populated here. nvm.
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