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> Bruce Momjian writes:
>
> > You can exclusively lock the table, then do a heap_getnext() scan over
> > the entire table, remove the dropped column, do a heap_insert(), then a
> > heap_delete() on the current tuple,
>
> Wow, that almost seems to easy to be true. I never thought that having
> tuples of different structures in the table at the same time would be
> possible. If so then I don't see a reason why this would be too hard to
> do.
If the transaction is not committed, I don't think anything actually
reads the tuple columns, so you are safe.
-- Bruce Momjian | http://www.op.net/~candle pgman@candle.pha.pa.us | (610)
853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill,
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