MVStore: temporary tables from result sets could survive re-opening a database,…

MVStore: temporary tables from result sets could survive re-opening a database, which could result in a ClassCastException.

h2/src/main/org/h2/expression/ConditionExists.java

@@ -8,7 +8,7 @@ package org.h2.expression;
 
 import org.h2.command.dml.Query;
 import org.h2.engine.Session;
-import org.h2.result.ResultInterface;
+import org.h2.result.LocalResult;
 import org.h2.table.ColumnResolver;
 import org.h2.table.TableFilter;
 import org.h2.util.StringUtils;
@@ -29,7 +29,7 @@ public class ConditionExists extends Condition {
     @Override
     public Value getValue(Session session) {
         query.setSession(session);
-        ResultInterface result = query.query(1);
+        LocalResult result = query.query(1);
         session.addTemporaryResult(result);
         boolean r = result.getRowCount() > 0;
         return ValueBoolean.get(r);

h2/src/main/org/h2/expression/ConditionInSelect.java

@@ -44,6 +44,7 @@ public class ConditionInSelect extends Condition {
     @Override
     public Value getValue(Session session) {
         query.setSession(session);
+        query.setDistinct(true);
         LocalResult rows = query.query(0);
         session.addTemporaryResult(rows);
         Value l = left.getValue(session);

h2/src/main/org/h2/index/ViewCursor.java

@@ -7,7 +7,7 @@
 package org.h2.index;
 
 import org.h2.message.DbException;
-import org.h2.result.ResultInterface;
+import org.h2.result.LocalResult;
 import org.h2.result.Row;
 import org.h2.result.SearchRow;
 import org.h2.table.Table;
@@ -20,12 +20,12 @@ import org.h2.value.ValueNull;
 public class ViewCursor implements Cursor {
 
     private final Table table;
-    private final Index index;
-    private final ResultInterface result;
+    private final ViewIndex index;
+    private final LocalResult result;
     private final SearchRow first, last;
     private Row current;
 
-    ViewCursor(Index index, ResultInterface result, SearchRow first,
+    ViewCursor(ViewIndex index, LocalResult result, SearchRow first,
             SearchRow last) {
         this.table = index.getTable();
         this.index = index;
@@ -49,7 +49,11 @@ public class ViewCursor implements Cursor {
         while (true) {
             boolean res = result.next();
             if (!res) {
-                result.close();
+                if (index.isRecursive()) {
+                    result.reset();
+                } else {
+                    result.close();
+                }
                 current = null;
                 return false;
             }

h2/src/main/org/h2/index/ViewIndex.java

@@ -17,7 +17,6 @@ import org.h2.expression.Comparison;
 import org.h2.expression.Parameter;
 import org.h2.message.DbException;
 import org.h2.result.LocalResult;
-import org.h2.result.ResultInterface;
 import org.h2.result.Row;
 import org.h2.result.SearchRow;
 import org.h2.result.SortOrder;
@@ -187,7 +186,7 @@ public class ViewIndex extends BaseIndex implements SpatialIndex {
     private Cursor find(Session session, SearchRow first, SearchRow last,
             SearchRow intersection) {
         if (recursive) {
-            ResultInterface recResult = view.getRecursiveResult();
+            LocalResult recResult = view.getRecursiveResult();
             if (recResult != null) {
                 recResult.reset();
                 return new ViewCursor(this, recResult, first, last);
@@ -209,6 +208,9 @@ public class ViewIndex extends BaseIndex implements SpatialIndex {
             left.disableCache();
             LocalResult r = left.query(0);
             LocalResult result = union.getEmptyResult();
+            // ensure it is not written to disk,
+            // because it is not closed normally
+            result.setMaxMemoryRows(Integer.MAX_VALUE);
             while (r.next()) {
                 result.addRow(r.currentRow());
             }
@@ -280,7 +282,7 @@ public class ViewIndex extends BaseIndex implements SpatialIndex {
                 }
             }
         }
-        ResultInterface result = query.query(0);
+        LocalResult result = query.query(0);
         return new ViewCursor(this, result, first, last);
     }