Hi,

I found a type in the comment for XLByteToSeg() and XLByteToPrevSeg().
This says "Compute ID and segment from an XLogRecPtr", but these
macros compute only segment numbers. I think "Compute a segment number
from an XLogRecPtr" is correct.

The definition of these macros were modified by the following commit,
but the comment were not.

commit dfda6ebaec6763090fb78b458a979b558c50b39b
Author: Heikki Linnakangas <heikki.linnakan...@iki.fi>
Date:   Sun Jun 24 18:06:38 2012 +0300

Regards,

-- 
Yugo Nagata <nag...@sraoss.co.jp>
diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h
index a661ec0..7453dcb 100644
--- a/src/include/access/xlog_internal.h
+++ b/src/include/access/xlog_internal.h
@@ -96,7 +96,7 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;
 		(dest) = (segno) * XLOG_SEG_SIZE + (offset)
 
 /*
- * Compute ID and segment from an XLogRecPtr.
+ * Compute a segment number from an XLogRecPtr.
  *
  * For XLByteToSeg, do the computation at face value.  For XLByteToPrevSeg,
  * a boundary byte is taken to be in the previous segment.  This is suitable
-- 
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