PSPP-BUG: [bug #20161] support automatic (de)compression for system/portable file I/O

[John Darrington]

Follow-up Comment #3, bug #20161 (project pspp):

I'm not saying that it wouldn't work, or that it wouldn't be a good idea (so
long as gzip compression is disabled by default).

I'm saying that if you pipe through gzip (or any compression tool), then it
produces nothing until it's input is closed.  Although "you" (pspp) will be
reading cases sequentially, the gzip process will have to store them all in
memory until after the very last one.  So some of the advantages of the
current implementation will be lost.  It'll mean for instance that
reading/writing will be considerably slower, and the maximum possible number
of cases will be smaller.

Just so long as users realize this, I don't think there will be a problem.

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