On Thu, 2006-07-20 at 18:19 -0400, Tom Lane wrote:
> About the best bet is to make sure that's the *only* available index,
> and set enable_seqscan = off to be sure.
Another approach would be to define a UDF that takes a query string,
runs the parser, rewriter, and planner on the string and then checks
various properties of the resulting Plan (e.g. that it includes a GiST
index scan).
-Neil