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
I am withdrawing my question for the following reason: https://forum.backdropcms.org/comment/8960#comment-8960
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