Prevent mark as deleted and as 'has free space' page in bloom module

Vacuum might put page into list of pages with some free space and mark as
deleted at the same time.

Author: feodor

contrib/bloom/blvacuum.c

@@ -108,15 +108,20 @@ blbulkdelete(IndexVacuumInfo *info, IndexBulkDeleteResult *stats,
 		Assert(itupPtr == BloomPageGetTuple(&state, page,
 								OffsetNumberNext(BloomPageGetMaxOffset(page))));
 
-		if (BloomPageGetFreeSpace(&state, page) > state.sizeOfBloomTuple &&
+		/*
+		 * Add page to notFullPage list if we will not mark page as deleted and
+		 * there is a free space on it
+		 */
+		if (BloomPageGetMaxOffset(page) == 0 &&
+			BloomPageGetFreeSpace(&state, page) > state.sizeOfBloomTuple &&
 			countPage < BloomMetaBlockN)
 			notFullPage[countPage++] = blkno;
 
 		/* Did we delete something? */
 		if (itupPtr != itup)
 		{
 			/* Is it empty page now? */
-			if (itupPtr == BloomPageGetData(page))
+			if (BloomPageGetMaxOffset(page) == 0)
 				BloomPageSetDeleted(page);
 			/* Adjust pg_lower */
 			((PageHeader) page)->pd_lower = (Pointer) itupPtr - page;