I think that people who are using index-only scans are going to want some way to find out the degree to which the scans are in fact index-only.
So here's a 5-line patch that adds the number of heap fetches to the EXPLAIN ANALYZE output. This might not be all the instrumentation we'll ever want here, but I think we at least want this much. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
explain-heap-fetches.patch
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