add assertion to ensure that possible left-over saved map is not picked up by new index

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

@@ -54,6 +54,7 @@ public class MVPrimaryIndex extends BaseIndex {
         ValueDataType keyType = new ValueDataType();
         ValueDataType valueType = new ValueDataType(db, sortTypes);
         mapName = "table." + getId();
+        assert db.isStarting() || !db.getStore().getMvStore().getMetaMap().containsKey("name." + mapName);
         Transaction t = mvTable.getTransactionBegin();
         dataMap = t.openMap(mapName, keyType, valueType);
         dataMap.map.setVolatile(!table.isPersistData() || !indexType.isPersistent());

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

@@ -58,6 +58,7 @@ public final class MVSecondaryIndex extends BaseIndex implements MVIndex {
         // even for unique indexes, as some of the index columns could be null
         keyColumns = columns.length + 1;
         String mapName = "index." + getId();
+        assert db.isStarting() || !db.getStore().getMvStore().getMetaMap().containsKey("name." + mapName);
         int[] sortTypes = new int[keyColumns];
         for (int i = 0; i < columns.length; i++) {
             sortTypes[i] = columns[i].sortType;