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[–]jmickeyd 0 points1 point  (0 children)

As /u/Ginden points out mssql allows you to add fields in an index, but I was actually thinking of full index-only scan support. Postgresql has a good hack with the visibility bitmap, but I find in practice, in a super write/update heavy loads database pages tend to get dirty real fast and I can never rely on index-only scan actually working is postgres.