Now that we've renamed "xlog" to "wal" in user-facing elements, I think
we should strive to use the name "wal" internally too in new code, not
"xlog" anymore. This patch introduces several variables, macros,
functions that ought to change names now -- XLogSegmentOffset should be
WALSegmentOffset for example. (I expect that as we touch code over
time, the use of "xlog" will decrease, though not fully disappear).
--
Álvaro Herrera https://www.2ndQuadrant.com/
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