Robert Haas <robertmhaas@gmail.com> writes:
> I think the fact that single-target INTO lists and multiple-target
> INTO lists are handled completely differently is extremely poor
> language design. It would have been far better, as you suggested
> downthread, to have added some syntax up front to let people select
> the behavior that they want, but I think there's little hope of
> changing this now without creating even more pain.
How so? The proposal I gave is fully backwards-compatible. It's
likely not the way we'd do it in a green field, but we don't have
a green field.
> I have a really hard time, however, imagining that anyone writes
> SELECT a, b, c, d, e, f, g, h, i, j, k INTO x, y, z and wants some of
> a-k to go into x, some more to go into y, and some more to go into z
> (and heaven help you if you drop a column from x or y -- now the whole
> semantics of the query change, yikes). What's reasonable is to write
> SELECT a, b, c INTO x, y, z and have those correspond 1:1.
That's certainly a case that we ought to support somehow. The problem is
staying reasonably consistent with the two-decades-old precedent of the
existing behavior for one target variable.
regards, tom lane
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