How to join multiple instances of same object in Android Room?

Question

NOTE: I cannot use relation as we had performance issue which is not reproduced on direct join query.

Until I added target user and from group use

Answer 1

as mentioned Moayad .AlMoghrabi I should use table aliases. So I renamed LEFT JOIN chat_user to LEFT JOIN chat_user target_user. Note there is no AS between chat-user and target_user. (my mistake was that I tried to put it there). Behavior of prefixes is still a mystery to me as the prefix for chat_user works properly, but if I put the prefix to ChatUserRelationEntity then I receive unknown column error.

SELECT * FROM message_item 
LEFT JOIN block_item
    ON block_item.block_message_id = message_item.message_local_id
LEFT JOIN chat_user_relation 
    ON chat_user_relation.chat_user_relation_chat_user_id = message_item.message_user_id
    AND chat_user_relation.chat_user_relation_chat_user_chat_id = :chatId
LEFT JOIN chat_user target_user 
    ON target_user.chat_user_id = message_item.messages_target_user
LEFT JOIN chat_user from_group_user 
    ON from_group_user.chat_user_id = message_item.messages_from_group_user
WHERE message_item.message_chat_id = :chatId
ORDER BY message_created_at ASC