On Dec 29, 2010, at 11:16 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> I really really dislike the notion of a "verification scan": it's
> basically work that is going to be useless if it fails.

I think it has potential in cases like text to xml.  In that case it'll either 
work or fail, with no possibility of requiring a do-over.  Scanning the whole 
table is a whole lot cheaper than rewriting it.  But I agree with your 
assessment of the "optimistic" verification scan case.

...Robert
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