[SPARK-14721][SQL] Remove HiveContext (part 2)

## What changes were proposed in this pull request?

This removes the class `HiveContext` itself along with all code usages associated with it. The bulk of the work was already done in #12485. This is mainly just code cleanup and actually removing the class.

Note: A couple of things will break after this patch. These will be fixed separately.
- the python HiveContext
- all the documentation / comments referencing HiveContext
- there will be no more HiveContext in the REPL (fixed by #12589)

## How was this patch tested?

No change in functionality.

Author: Andrew Or <andrew@databricks.com>

Closes #12585 from andrewor14/delete-hive-context.

1 files changed, 7 insertions, 1 deletions

diff --git a/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala b/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
index 5c8742d1d8..131f28f98b 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
@@ -905,7 +905,7 @@ class SparkSession private(
 }
 
 
-private object SparkSession {
+object SparkSession {
 
   private def sharedStateClassName(conf: SparkConf): String = {
     conf.get(CATALOG_IMPLEMENTATION) match {
@@ -938,4 +938,10 @@ private object SparkSession {
     }
   }
 
+  // TODO: do we want to expose this?
+  def withHiveSupport(sc: SparkContext): SparkSession = {
+    sc.conf.set(CATALOG_IMPLEMENTATION.key, "hive")
+    new SparkSession(sc)
+  }
+
 }