DRILL-540: Allow querying hive views in Drill

1. Added DrillHiveViewTable which allows construction of DrillViewTable based
   on Hive metadata
2. Added initialization of DrillHiveViewTable in HiveSchemaFactory
3. Extracted conversion of Hive data types from DrillHiveTable
   to HiveToRelDataTypeConverter
4. Removed throwing of UnsupportedOperationException from HiveStoragePlugin
5. Added TestHiveViewsSupport and authorization tests
6. Added closeSilently() method to AutoCloseables
closes #1559

1 files changed, 13 insertions, 1 deletions

diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillViewTable.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillViewTable.java
index 2eb9137ef..a90a135f8 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillViewTable.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillViewTable.java
@@ -17,6 +17,9 @@
  */
 package org.apache.drill.exec.planner.logical;
 
+import java.util.List;
+
+import org.apache.calcite.schema.SchemaPlus;
 import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList;
 import org.apache.calcite.config.CalciteConnectionConfig;
 import org.apache.calcite.schema.Schema.TableType;
@@ -67,7 +70,7 @@ public class DrillViewTable implements TranslatableTable, DrillViewInfoProvider
 
       if (viewExpansionContext.isImpersonationEnabled()) {
         token = viewExpansionContext.reserveViewExpansionToken(viewOwner);
-        rel = context.expandView(rowType, view.getSql(), token.getSchemaTree(), view.getWorkspaceSchemaPath()).rel;
+        rel = expandViewForImpersonatedUser(context, rowType, view.getWorkspaceSchemaPath(), token.getSchemaTree());
       } else {
         rel = context.expandView(rowType, view.getSql(), view.getWorkspaceSchemaPath(), ImmutableList.<String>of()).rel;
       }
@@ -85,6 +88,14 @@ public class DrillViewTable implements TranslatableTable, DrillViewInfoProvider
     }
   }
 
+
+  protected RelNode expandViewForImpersonatedUser(ToRelContext context,
+                                                  RelDataType rowType,
+                                                  List<String> workspaceSchemaPath,
+                                                  SchemaPlus tokenSchemaTree) {
+    return context.expandView(rowType, view.getSql(), tokenSchemaTree, workspaceSchemaPath).rel;
+  }
+
   @Override
   public TableType getJdbcTableType() {
     return TableType.VIEW;
@@ -104,4 +115,5 @@ public class DrillViewTable implements TranslatableTable, DrillViewInfoProvider
   @Override public boolean isRolledUp(String column) {
     return false;
   }
+
 }