We have submitted a patch for 9.3
, but currently it is still missing a reviewer.
As my French colleague Dimitri Fontaine was pointing out a few days ago, PostgreSQL 9.2 is out. This is another great release for PostgreSQL, but we are already ahead in the development of the next release: PostgreSQL 9.3.
The Italian team of 2ndQuadrant has been working since last year on adding a new feature to PostgreSQL: support of referential integrity between the elements of an array in a table (referencing) and the records of another table (referenced).
We renamed it "Array ELEMENT foreign keys" - thanks to the feedback received from the hackers list. As you may have guessed, it is not part of the SQL standard.