[postgis-devel] ST_Envelope & spatial index

[Sandro Santilli]

On Tue, Mar 13, 2012 at 11:07:24PM +0100, Andrea Peri wrote:

> select ST_Extent(ST_Envelope(rast)) from tabella;
> 
> But it take many time, too time I guess.

I think it'll fully decompress each value.
If that's the case it could be optimized by only fetching
the header instead.

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