schemaName = value.getString();
tableName = bindings.getValue(1).getString();
TableName groupName = new TableName(schemaName, tableName);
Group group = context.getStore().schema().ais().getGroup(groupName);
if (group == null)
throw new NoSuchGroupException(groupName);
StorageDescription storage = group.getStorageDescription();
if (!(storage instanceof ProtobufStorageDescription))
throw new InvalidParameterValueException("group does not use STORAGE_FORMAT protobuf");
FileDescriptorProto fileProto = ((ProtobufStorageDescription)storage).getFileProto();
try {