Tom Lane wrote:

The effect of this, as Andrew says, is that in this particular context
you can't write SET as an alias unless you write AS first.  This is
probably not going to surprise anyone in the UPDATE case, since the
ambiguity inherent in writing
        UPDATE foo set SET ...
is pretty obvious.  However it might surprise someone in the DELETE

You probably avoid that if you have a separate rule for the DELETE case. That raises this question: how far do we want to go in unfactoring the grammar to handle such cases?



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