660d5fb856
Since we're requiring pages handled by generic_xlog.c to be standard format, specify REGBUF_STANDARD when doing a full-page image, so that xloginsert.c can compress out the "hole" between pd_lower and pd_upper. Given the current API in which this path will be taken only for a newly initialized page, the hole is likely to be particularly large in such cases, so that this oversight could easily be performance-significant. I don't notice any particular change in the runtime of contrib/bloom's regression test, though.
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