fix upsert core and cross-partition upsert

src/include/nodes/plannodes.h

@@ -432,6 +432,7 @@ typedef struct ModifyTable {
     List* updateTlist;			/* List of UPDATE target */
     List* exclRelTlist;		   /* target list of the EXECLUDED pseudo relation */
     Index exclRelRTIndex;			 /* RTI of the EXCLUDED pseudo relation */
+    bool partKeyUpsert;
 
     OpMemInfo mem_info;    /*  Memory info for modify node */
 } ModifyTable;

src/include/nodes/primnodes.h

@@ -1398,6 +1398,7 @@ typedef struct UpsertExpr {
     List* updateTlist;        /* List of UPDATE TargetEntrys */
     List* exclRelTlist;       /* tlist of the 'EXCLUDED' pseudo relation */
     int exclRelIndex;        /* RT index of 'EXCLUDED' relation */
+    bool partKeyUpsert;      /* we allow upsert index key and partition key in B_FORMAT */
 } UpsertExpr;
 
 #endif /* PRIMNODES_H */