Tom Lane c75be2ad60 Change ON UPDATE SET NULL/SET DEFAULT referential actions to meet SQL spec. ... Previously, when executing an ON UPDATE SET NULL or SET DEFAULT action for a multicolumn MATCH SIMPLE foreign key constraint, we would set only those referencing columns corresponding to referenced columns that were changed. This is what the SQL92 standard said to do --- but more recent versions of the standard say that all referencing columns should be set to null or their default values, no matter exactly which referenced columns changed. At least for SET DEFAULT, that is clearly saner behavior. It's somewhat debatable whether it's an improvement for SET NULL, but it appears that other RDBMS systems read the spec this way. So let's do it like that. This is a release-notable behavioral change, although considering that our documentation already implied it was done this way, the lack of complaints suggests few people use such cases.		2012-06-18 12:12:52 -04:00
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src	Change ON UPDATE SET NULL/SET DEFAULT referential actions to meet SQL spec.	2012-06-18 12:12:52 -04:00
bug.template	Stamp HEAD as 9.3devel.	2012-06-13 20:03:02 -04:00
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