[Bizgres-general] WAL bypass for CTAS

[Luke Lonergan]

Simon,

I've ported your WAL bypass patch for CREATE TABLE AS SELECT (CTAS) in
addition to your COPY prep patch that also bypasses WAL to postgres 8.0.2
(attached).

I ran a couple of tests, both on CTAS and on COPY and found no WAL bypass
occurred (size of XLOG directory is same as data directory).  Since your
patches only allow WAL bypass when not in "Archive mode" aka PITR, or when
XLogArchivingActive() is false, when is that exactly?  Under what conditions
will we not be in PITR mode?

Looking for a simple way to trigger the expected behavior.

Luke

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