I know this is not even a test but i thought it might be a client library issue, not server itself. Well it is not, i tried it on .net with npgsql which is a .net client library (Not using libpq). Results are same. Connect time does not have much effect by the way.
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
