In comment_entity_info() the comment module is specifying in "entity keys" that its bundle is "node_type", but there is no corresponding column in the comment table. That makes it impossible to query comment entities by bundle without pulling in the node information that each comment is attached to.
GitHub Issue #:
2046
Recent comments
Here are some more details about my setup. Yes, I am using a contextual filter. Specifically, I have several content types that have an entity reference field meant to hold references to...
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You can use Rules or the Node Notify module for comments. When a new account is created, I believe there are Rules to send.
Email notifications
There's a few way to accomplish it, but it really depends on your full requirements. I'm working on a contact management module but it won't be released for a few months. There...
Pairing fields