When upgrading from an older 1.3.x version to version 1.3.157, when using BLOB…

When upgrading from an older 1.3.x version to version 1.3.157, when using BLOB or CLOB data, the database could only be opened once.

h2/src/main/org/h2/command/ddl/AlterTableAlterColumn.java

@@ -373,7 +373,8 @@ public class AlterTableAlterColumn extends SchemaCommand {
         String newTableName = newTable.getName();
         Database db = sourceTable.getDatabase();
         // save the real table under a temporary name
-        db.renameSchemaObject(session, sourceTable, db.getTempTableName(sourceTableName, session));
+        String temp = db.getTempTableName(sourceTableName, session);
+        db.renameSchemaObject(session, sourceTable, temp);
         try {
             // have our new table impersonate the target table
             db.renameSchemaObject(session, newTable, sourceTableName);