invoke beforeWrite() in append mode, fix unsaved memory accounting in flushAppendBuffer

h2/src/main/org/h2/mvstore/MVMap.java

@@ -1232,6 +1232,7 @@ public class MVMap<K, V> extends AbstractMap<K, V>
                         }
                     }
                 } else {
+                    tip = tip.parent;
                     page = Page.createLeaf(this,
                             Arrays.copyOf(keysBuffer, keyCount),
                             Arrays.copyOf(valuesBuffer, keyCount),
@@ -1323,6 +1324,7 @@ public class MVMap<K, V> extends AbstractMap<K, V>
      * @param value to be appended
      */
     public void append(K key, V value) {
+        beforeWrite();
         RootReference rootReference = lockRoot(getRoot(), 1);
         int appendCounter = rootReference.getAppendCounter();
         try {

h2/src/main/org/h2/mvstore/db/MVPlainTempResult.java

@@ -62,14 +62,14 @@ class MVPlainTempResult extends MVTempResult {
         super(database, expressions.length, visibleColumnCount);
         ValueDataType valueType = new ValueDataType(database, new int[columnCount]);
         Builder<Long, ValueRow> builder = new MVMap.Builder<Long, ValueRow>()
-                                                .valueType(valueType);
+                                                .valueType(valueType).singleWriter();
         map = store.openMap("tmp", builder);
     }
 
     @Override
     public int addRow(Value[] values) {
         assert parent == null;
-        map.put(counter++, ValueRow.get(values));
+        map.append(counter++, ValueRow.get(values));
         return ++rowCount;
     }