Andreas Kretschmer <akretsch...@spamfence.net> writes:
> You can check the plan with the auto_explain - Extension, and you can
> force the planner to create a plan based on the actual input-value by
> using dynamic SQL (EXECUTE 'your query string' inside the function)

Steve *is* using EXECUTE, so that doesn't seem to be the answer.  I'm
wondering about datatype mismatches myself --- the function form is
forcing the parameter to be char(9), which is not a constraint imposed
in the written-out query.  There are lots of other possibilities
though.  It would be hard to say much without a self-contained example
to try.

                        regards, tom lane

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