Add a FIXME for potential failures in other files.

Author: avamingli

src/backend/access/gin/ginpostinglist.c

@@ -338,11 +338,14 @@ ginPostingListDecodeAllSegments(GinPostingList *segment, int len, int *ndecoded_
 		/*
 		 * Keep this commented out.
 		 * See comments in itemptr_to_uint64().
+		 * 
+		 * FIXME: Correct like this in other files (e.g., ginpostinglist.c and gist.c)
+		 * if we can reproduce the cases.
 		 */
 #if 0
 		Assert(OffsetNumberIsValid(ItemPointerGetOffsetNumber(&segment->first)));
 #endif
-		Assert(ndecoded == 0 || ginCompareItemPointers(&segment->first, &result[ndecoded - 1]) > 0);
+			Assert(ndecoded == 0 || ginCompareItemPointers(&segment->first, &result[ndecoded - 1]) > 0);
 		result[ndecoded] = segment->first;
 		ndecoded++;