This function returns a newly allocated mongoc_cursor_t that should be freed with mongoc_cursor_destroy when no longer in use. The returned mongoc_cursor_t is never NULL, even on error. The user must call mongoc_cursor_next on the returned mongoc_cursor_t to execute the initial command.

Cursor errors can be checked with mongoc_cursor_error_document. It always fills out the bson_error_t if an error occurred, and optionally includes a server reply document if the error occurred server-side.