What I'm thinking about right now is tweaking the index-build code to write to WAL only if it sees that PITR is actually in use. It would have to look at the GUC variables to determine whether WAL archiving is enabled. If archiving isn't turned on, then we could assume that rollforward from a past backup isn't needed in this installation, and use the WAL-less index build method.
Seems reasonable.
Chris
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