Yes, perhaps the easiest way is to output the query into an array holding the post title and content. Then you can find each unique $post_title and then loop through the original array and concatenate each $post_content when the $post_title is found.

$post_titles = array_unique($yourarrayofpost_titles);

This will give you the unique titles.

Then for each $post_titles, loop through the returned records and build out the string. Hope that helps! It’s hard for me to see/write/test without working with the core.

Doug