[PERFORM] TIP 9: the planner will ignore... & datatypes

[Marc Mamin]

TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match


But INT2, INT4, INT8 and "SERIAL" are considered to be a unique datatype.
Am I Right?

Thanks,

Marc

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TIP 8: explain analyze is your friend