Does the Redhat PostgreSQL package available in RHEL5 and/or RHEL6 provide the ability “to do index-only scans”?

Solution Unverified - Updated -

Issue

The open source 9.2 version (and later) of PostgreSQL provides the ability to perform index-only scans. Does the Redhat PostgreSQL package that is bundled in RHEL5 and/or RHEL6 provide the same ability?

Environment

Red Hat Enterprise Linux (RHEL) 5
Red Hat Enterprise Linux (RHEL) 6
PostgreSQL 9.2

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