I looked through the patch. Sources are OK. However I didn't find any docs and test cases. Would you please provide me with short description on this feature and why it is important. Because I didn't manage to find the old Andrew Dunstan's post either.
Feature sounds OK, so lets do it.
Pavel S, please submit a polished patch. Coding guidelines, tests, docs etc. Set back to Waiting On Author.
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Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services