Rewrite comment for slightly greater accuracy.

robertmhaas · robertmhaas · commit 0e1c4b7d974b · 2011-11-08T08:11:25.000-05:00
Per an observation from Thom Brown that the old version contained a typo.
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
@@ -488,8 +488,9 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
 		if (!ConditionalLockBufferForCleanup(buf))
 		{
 			/*
-			 * It's OK to skip vacuuming a page, as long as its not got data
-			 * that needs to be cleaned for wraparound avoidance.
+			 * If we're not scanning the whole relation to guard against XID
+			 * wraparound, it's OK to skip vacuuming a page.  The next vacuum
+			 * will clean it up.
 			 */
 			if (!scan_all)
 			{

Original file line number	Diff line number	Diff line change
`@@ -488,8 +488,9 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,`
`488`	`488`	`if (!ConditionalLockBufferForCleanup(buf))`
`489`	`489`	`{`
`490`	`490`	`/*`
`491`		`- * It's OK to skip vacuuming a page, as long as its not got data`
`492`		`- * that needs to be cleaned for wraparound avoidance.`
	`491`	`+ * If we're not scanning the whole relation to guard against XID`
	`492`	`+ * wraparound, it's OK to skip vacuuming a page. The next vacuum`
	`493`	`+ * will clean it up.`
`493`	`494`	`*/`
`494`	`495`	`if (!scan_all)`
`495`	`496`	`{`