"Robert Osowiecki" <robson(at)cavern(dot)pl> writes:
> BUT when on "where ar_code = 'FOO'" unique_code_i index is used and query
> returns NO ROWS!
Could you be more specific? Which values of 'FOO' does this happen for?
What is the datatype of ar_code? If it's a string type, what locale and
encoding are you using? You have not given nearly enough information to
let anyone else reproduce the problem.
regards, tom lane