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...

      --NestedOp

        – Inner Join (J1)

          –  – (Right branch) ..... (L1)

          – (Left branch) ..... (R1)

                    --Nested-Tuple-Source          – ..... (R1)

    }

    --InputOp

      .....

(Note that pipeline L1 R1 must satisfy the condition that it does not drop any tuples.)

...

     --LeftOuterJoin (J1)

       (left branch)           – Assign v_new=TRUE

              –  ......  (L1R1)

                 – InputOp

...

       (right branch)

             – Assign v_new=TRUE 

                – ..... (R1L1)

In the plan, v_lc_1, ..., v_lc_n are live "covering" variables at InputOp and v_l1, ....v_ln in the decoration part of the added group-by operator are all live variables at InputOp except the covering variables v_lc_1, ..., v_lc_n.  In the current implementation, we use "covering" variables as primary key variables. In the next version, we will use the real primary key variables, which will fix ASTERIXDB-1168.

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