use SQL functions (instead of plpgsql) defined as stabe and strict for
* content_folder__is_folder * content_folder__is_sub_folder, and …
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use SQL functions (instead of plpgsql) defined as stabe and strict for * content_folder__is_folder * content_folder__is_sub_folder, and * content_folder__is_empty... having as well more sane constructs returning boolean values
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