Tom Lane 83cd2d8b0f Make heap_fetch API more consistent by having the buffer remain pinned
in all cases when keep_buf = true.  This allows ANALYZE's inner loop to
use heap_release_fetch, which saves multiple buffer lookups for the same
page and avoids overestimation of cost by the vacuum cost mechanism.
2004-10-26 16:05:03 +00:00
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