Checks whether this channel is a distinct GroupChannel. For a distinct GroupChannel, later when you create GroupChannel with same User and isDistinct flag being true (refer to createChannel), the channel URL does not change, which means the messages between Users remain at the channel. If the channel is not distinct one, a new GroupChannel is created even though Users are same. As a result, you get a totally new channel URL (the old channel still remains), which means the Users start new conversation.