Merge branch 'PGPROEE10_1521' into PGPROEE10

Author: vbwagner

src/backend/access/nbtree/nbtsort.c

@@ -1083,10 +1083,14 @@ _bt_load(BTWriteState *wstate, BTSpool *btspool, BTSpool *btspool2)
 				 * to compare it with the following tuple
 				 * and maybe unite them into a posting tuple
 				 */
-				itupprev = itup;
+				if (itupprev)
+					pfree(itupprev);
+				itupprev = CopyIndexTuple(itup);
 
 				/* compute max size of ipd list */
-				maxpostingsize = maxitemsize - IndexInfoFindDataOffset(itupprev->t_info) - MAXALIGN(IndexTupleSize(itupprev));
+				maxpostingsize = maxitemsize -
+								 IndexInfoFindDataOffset(itupprev->t_info) -
+								 MAXALIGN(IndexTupleSize(itupprev));
 			}
 
 			/* Handle the last item.*/