Is there any consensus about whether to include these two parameters as
GUCs or constants if my patch is to be accepted?

(1) sync_scan_threshold: Use synchronized scanning for tables greater
than this many pages; smaller tables will not be affected.
(2) sync_scan_offset: Start a new scan this many pages before a
currently running scan to take advantage of the pages
 that are likely already in cache.

Right now they are just constants defined in a header, but a GUC might
make sense. I'd like to know which version is more acceptable when I
submit my final patch.

        Jeff Davis

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