ASTERIXDB-1168: use either primary key or generated id for decorrelation.

Change-Id: Ib5e232f3ba99018cd1aedfa4f8bb2f98affa0f55
Reviewed-on: https://asterix-gerrit.ics.uci.edu/696
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Jianfeng Jia <jianfeng.jia@gmail.com>
Reviewed-by: Till Westmann <tillw@apache.org>
diff --git a/asterix-app/src/test/resources/optimizerts/results/udfs/query-ASTERIXDB-1018.plan b/asterix-app/src/test/resources/optimizerts/results/udfs/query-ASTERIXDB-1018.plan
index 1e7e505..3b7f231 100644
--- a/asterix-app/src/test/resources/optimizerts/results/udfs/query-ASTERIXDB-1018.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/udfs/query-ASTERIXDB-1018.plan
@@ -4,71 +4,69 @@
       -- ASSIGN  |PARTITIONED|
         -- STREAM_PROJECT  |PARTITIONED|
           -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-            -- HYBRID_HASH_JOIN [$$34][$$50]  |PARTITIONED|
+            -- HYBRID_HASH_JOIN [$$34][$$47]  |PARTITIONED|
               -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                 -- STREAM_PROJECT  |PARTITIONED|
                   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                     -- DATASOURCE_SCAN  |PARTITIONED|
                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                         -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
-              -- HASH_PARTITION_EXCHANGE [$$50]  |PARTITIONED|
+              -- HASH_PARTITION_EXCHANGE [$$47]  |PARTITIONED|
                 -- STREAM_PROJECT  |PARTITIONED|
                   -- ASSIGN  |PARTITIONED|
                     -- STREAM_PROJECT  |PARTITIONED|
                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                        -- PRE_CLUSTERED_GROUP_BY[$$55, $$24, $$54]  |PARTITIONED|
+                        -- PRE_CLUSTERED_GROUP_BY[$$51, $$24, $$52]  |PARTITIONED|
                                 {
                                   -- AGGREGATE  |LOCAL|
                                     -- STREAM_SELECT  |LOCAL|
                                       -- NESTED_TUPLE_SOURCE  |LOCAL|
                                 }
                           -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                            -- STABLE_SORT [$$55(ASC), $$24(ASC), $$54(ASC)]  |PARTITIONED|
-                              -- HASH_PARTITION_EXCHANGE [$$55, $$24, $$54]  |PARTITIONED|
+                            -- STABLE_SORT [$$51(ASC), $$24(ASC), $$52(ASC)]  |PARTITIONED|
+                              -- HASH_PARTITION_EXCHANGE [$$51, $$24, $$52]  |PARTITIONED|
                                 -- STREAM_PROJECT  |PARTITIONED|
                                   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                     -- NESTED_LOOP  |PARTITIONED|
                                       -- BROADCAST_EXCHANGE  |PARTITIONED|
-                                        -- STREAM_PROJECT  |PARTITIONED|
-                                          -- STREAM_SELECT  |PARTITIONED|
-                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                              -- PRE_CLUSTERED_GROUP_BY[$$49, $$35]  |PARTITIONED|
-                                                      {
-                                                        -- AGGREGATE  |LOCAL|
-                                                          -- STREAM_SELECT  |LOCAL|
-                                                            -- NESTED_TUPLE_SOURCE  |LOCAL|
-                                                      }
-                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                                  -- STABLE_SORT [$$49(ASC), $$35(ASC)]  |PARTITIONED|
-                                                    -- HASH_PARTITION_EXCHANGE [$$49, $$35]  |PARTITIONED|
-                                                      -- STREAM_PROJECT  |PARTITIONED|
-                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                                          -- HYBRID_HASH_JOIN [$$47][$$38]  |PARTITIONED|
-                                                            -- HASH_PARTITION_EXCHANGE [$$47]  |PARTITIONED|
-                                                              -- NESTED_LOOP  |PARTITIONED|
-                                                                -- BROADCAST_EXCHANGE  |PARTITIONED|
-                                                                  -- STREAM_PROJECT  |PARTITIONED|
-                                                                    -- ASSIGN  |PARTITIONED|
-                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                                                        -- DATASOURCE_SCAN  |PARTITIONED|
-                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
-                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- STREAM_SELECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- PRE_CLUSTERED_GROUP_BY[$$35, $$46]  |PARTITIONED|
+                                                    {
+                                                      -- AGGREGATE  |LOCAL|
+                                                        -- STREAM_SELECT  |LOCAL|
+                                                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                                    }
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- STABLE_SORT [$$35(ASC), $$46(ASC)]  |PARTITIONED|
+                                                  -- HASH_PARTITION_EXCHANGE [$$35, $$46]  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- HYBRID_HASH_JOIN [$$44][$$38]  |PARTITIONED|
+                                                          -- HASH_PARTITION_EXCHANGE [$$44]  |PARTITIONED|
+                                                            -- NESTED_LOOP  |PARTITIONED|
+                                                              -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
                                                                   -- ASSIGN  |PARTITIONED|
-                                                                    -- STREAM_PROJECT  |PARTITIONED|
-                                                                      -- ASSIGN  |PARTITIONED|
-                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                                                          -- DATASOURCE_SCAN  |PARTITIONED|
-                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
-                                                            -- HASH_PARTITION_EXCHANGE [$$38]  |PARTITIONED|
-                                                              -- STREAM_PROJECT  |PARTITIONED|
-                                                                -- ASSIGN  |PARTITIONED|
-                                                                  -- STREAM_PROJECT  |PARTITIONED|
                                                                     -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                                                       -- DATASOURCE_SCAN  |PARTITIONED|
                                                                         -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                                                           -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ASSIGN  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- DATASOURCE_SCAN  |PARTITIONED|
+                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                          -- HASH_PARTITION_EXCHANGE [$$38]  |PARTITIONED|
+                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                              -- ASSIGN  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                    -- DATASOURCE_SCAN  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
                                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                         -- STREAM_PROJECT  |PARTITIONED|
                                           -- ASSIGN  |PARTITIONED|