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In generate_orderedappend_paths(), the function does not handle the case where the paths in total_subpaths and fractional_subpaths are identical. This situation is not uncommon, and as a result, it may generate two exactly identical ordered append paths. Fix by checking whether total_subpaths and fractional_subpaths contain the same paths, and skipping creation of the ordered append path for the fractional case when they are identical. Given the lack of field complaints about this, I'm a bit hesitant to back-patch, but let's clean it up in HEAD. Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Andrei Lepikhov <lepihov@gmail.com> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Discussion: https://postgr.es/m/CAMbWs4-OYsgA75tGGiBARt87G0y_z_GBTSLrzudcJxAzndYkYw@mail.gmail.com