Florian G. Pflug wrote:

Is there consensus what the correct behaviour should be for
self-referential updates in read-committed mode? Does the SQL Spec
have anything to say about this?

This seems to have gone all quiet. Do we need a TODO to keep a note of it? Just "correct behaviour for self-referential updates"

Hiroshi originally noted the problem in one of his views here:

  Richard Huxton
  Archonet Ltd

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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

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