delete-before-fix-wip1.patch

*** a/src/backend/executor/execMain.c
--- b/src/backend/executor/execMain.c
***************
*** 1847,1854 **** EvalPlanQualFetch(EState *estate, Relation relation, int lockmode,
  			switch (test)
  			{
  				case HeapTupleSelfUpdated:
- 					/* treat it as deleted; do not process */
  					ReleaseBuffer(buffer);
  					return NULL;
  
  				case HeapTupleMayBeUpdated:
--- 1847,1862 ----
  			switch (test)
  			{
  				case HeapTupleSelfUpdated:
  					ReleaseBuffer(buffer);
+ 					if (!ItemPointerEquals(&update_ctid, &tuple.t_self))
+ 					{
+ 						/* it was updated, so look at the updated version */
+ 						tuple.t_self = update_ctid;
+ 						/* updated row should have xmin matching this xmax */
+ 						priorXmax = update_xmax;
+ 						continue;
+ 					}
+ 					/* treat it as deleted; do not process */
  					return NULL;
  
  				case HeapTupleMayBeUpdated:
*** a/src/backend/executor/nodeModifyTable.c
--- b/src/backend/executor/nodeModifyTable.c
***************
*** 354,359 **** ldelete:;
--- 354,375 ----
  		switch (result)
  		{
  			case HeapTupleSelfUpdated:
+ 				if (!ItemPointerEquals(tupleid, &update_ctid))
+ 				{
+ 					HeapTuple	copyTuple;
+ 
+ 					estate->es_output_cid = GetCurrentCommandId(false);
+ 					copyTuple = EvalPlanQualFetch(estate,
+ 												  resultRelationDesc,
+ 												  LockTupleExclusive,
+ 												  &update_ctid,
+ 												  update_xmax);
+ 					if (copyTuple != NULL)
+ 					{
+ 						*tupleid = update_ctid;
+ 						goto ldelete;
+ 					}
+ 				}
  				/* already deleted by self; nothing to do */
  				return NULL;