Two changes requested by code reviewers

h2/src/main/org/h2/command/dml/Select.java

@@ -1060,7 +1060,7 @@ public class Select extends Query {
         StatementBuilder buff = new StatementBuilder();
         for (TableFilter f : topFilters) {
             Table t = f.getTable();
-            TableView tableView = (t instanceof TableView) ? (TableView) t : null;
+            TableView tableView = t.isView() ? (TableView) t : null;
             if (tableView != null && tableView.isRecursive() && tableView.isTableExpression()) {
                 
                 if (tableView.isPersistent()) {

h2/src/main/org/h2/engine/Session.java

@@ -6,13 +6,14 @@
 package org.h2.engine;
 
 import java.util.ArrayList;
+import java.util.Deque;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.Map;
 import java.util.Random;
-import java.util.Stack;
+import java.util.ArrayDeque;
 import java.util.concurrent.TimeUnit;
 import org.h2.api.ErrorCode;
 import org.h2.command.Command;
@@ -122,7 +123,7 @@ public class Session extends SessionWithState {
     private long modificationMetaID = -1;
     private SubQueryInfo subQueryInfo;
     private int parsingView;
-    private Stack<String> viewNameStack = new Stack<String>();    
+    private Deque<String> viewNameStack = new ArrayDeque<String>();    
     private int preparingQueryExpression;
     private volatile SmallLRUCache<Object, ViewIndex> viewIndexCache;
     private HashMap<Object, ViewIndex> subQueryIndexCache;