I notice that there isn't a parameter called enable_indexonly (or similar).
ISTM that such a major new feature should be controlled by a planner
method parameter, just as all the existing planner methods are.
This will help us evaluate index only scans in production, and turn
them off if they have negative impacts.
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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