We've been seeing these same messages flying by our logs for years:
2012-12-13 22:28:07 GMT LOG: picksplit method for column 2 of index "xxxxxxxxxxxxxxx_idx" doesn't support secondary split
I see from the linked message that Tom Lane made the recommendation of changing the loglevel from LOG to DEBUG1. As such, I've gone ahead and made this change and attached the patch file. http://archives.postgresql.org/pgsql-general/2007-08/msg01810.php
The patch itself was created against the latest master.
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