How about adding a column to pg_am indicating "these indexes must always
keep same tuple count as heap". This would be true for all current AMs,
false for GIN.
Yes, it's simplest solution, but it doesn't check of index consistency.
Possible, we can count number of itempointers to heap tuple during build/insert,
and during bulkdelete we count number of deleted and leaved itempointers. So,
N[before bulkdelete] == N[after bulkdelete] + N[deleted]
--
Teodor Sigaev E-mail: [EMAIL PROTECTED]
WWW: http://www.sigaev.ru/
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