Re: [GENERAL] Computing transitive closure of a table

[Bricklen Anderson]

There was a thread last November entitled "Transitive closure of a 
directed graph" on the [HACKERS] list. There may be some information of 
use there.

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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