schemas.put(infoSchema.getName(), infoSchema);
publicRole = new Role(this, 0, Constants.PUBLIC_ROLE_NAME, true);
roles.put(Constants.PUBLIC_ROLE_NAME, publicRole);
systemUser.setAdmin(true);
systemSession = new Session(this, systemUser, ++nextSessionId);
CreateTableData data = new CreateTableData();
ArrayList<Column> cols = data.columns;
Column columnId = new Column("ID", Value.INT);
columnId.setNullable(false);
cols.add(columnId);
cols.add(new Column("HEAD", Value.INT));