@@ -223,12 +223,12 @@ partition_router_exec(CustomScanState *node)
223223/* Magic: replace parent's ResultRelInfo with ours */
224224estate -> es_result_relation_info = state -> current_rri ;
225225
226- /*Delete tuple from old partition */
226+ /*Lock or delete tuple from old partition */
227227Assert (ItemPointerIsValid (& ctid ));
228228slot = router_lock_or_delete_tuple (state ,slot ,& ctid ,
229229& deleted ,estate );
230230
231- /* We require a tuple */
231+ /* We require a tuple(previous one has vanished) */
232232if (TupIsNull (slot ))
233233gototake_next_tuple ;
234234
@@ -265,12 +265,15 @@ partition_router_rescan(CustomScanState *node)
265265}
266266
267267void
268- partition_router_explain (CustomScanState * node ,List * ancestors ,ExplainState * es )
268+ partition_router_explain (CustomScanState * node ,
269+ List * ancestors ,
270+ ExplainState * es )
269271{
270272/* Nothing to do here now */
271273}
272274
273275
276+ /* Smart wrapper over ModifyTable */
274277static TupleTableSlot *
275278router_run_modify_table (PlanState * state )
276279{
@@ -309,6 +312,7 @@ router_run_modify_table(PlanState *state)
309312return slot ;
310313}
311314
315+ /* Return tuple OR stash it and change ModifyTable's operation */
312316static TupleTableSlot *
313317router_set_slot (PartitionRouterState * state ,
314318TupleTableSlot * slot ,
@@ -337,6 +341,7 @@ router_set_slot(PartitionRouterState *state,
337341return NULL ;
338342}
339343
344+ /* Fetch next tuple (either fresh or stashed) */
340345static TupleTableSlot *
341346router_get_slot (PartitionRouterState * state ,
342347bool * should_process )