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PSPP-BUG: [bug #20910] GUI becomes extremely slow after executing syntax

From: Ben Pfaff
Subject: PSPP-BUG: [bug #20910] GUI becomes extremely slow after executing syntax which doesn't read the data
Date: Fri, 14 Sep 2007 05:05:46 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20061205 Iceweasel/ (Debian-

Follow-up Comment #8, bug #20910 (project pspp):

>Couldn't the struct casereader contain a serial number ? 

Sure.  Then execute_syntax needs to record the serial number before sticking
the lazy casereader into the data set and compare the serial number of the
data set's casereader against the one it recorded after running the syntax. 
For the proper level of abstraction, we could encapsulate the serial number in
a structure and provide a function to compare serial numbers.  If you call
that structure "struct lazy_status", we're right back where we are now :-)

Seriously, a serial number protocol would work fine, but I don't see how it's
an improvement.  Maybe you have a suggestion for how to do better with a
serial number protocol.


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