commit 947fc3cb209a6e7e37b435ea35f0d856f3c35dc7
author Yingyi Bu <yingyi@couchbase.com> Wed Jan 27 20:14:47 2016 -0800
committer Yingyi Bu <buyingyi@gmail.com> Wed Jan 27 20:42:09 2016 -0800
tree bc94f091ce2f771a1843734b36a6585f0894f757
parent bf34d187dd0077b81c01126bbd4b83a15519a425

ASTERIXDB-1005, ASTERIXDB-1263: Clean up subplan flattening:
1. Inline NestedTupleSource and remove SubplanOperator for special cases that
   join operators inside the SubplanOperator can be re-targeted for
   correlations;
2. Blindly inline NestedTupleSource and remove SubplanOperator for general cases
   where the condition of the special case is not met.

Change-Id: I4dd130a25f3c81272cc23f844ea20e376e990612
Reviewed-on: https://asterix-gerrit.ics.uci.edu/579
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>

asterix-app/src/test/resources/optimizerts/results/push-project-through-group.plan

diff --git a/asterix-app/src/test/resources/optimizerts/results/push-project-through-group.plan b/asterix-app/src/test/resources/optimizerts/results/push-project-through-group.plan
index 86bcdac..3cc71e0 100644
--- a/asterix-app/src/test/resources/optimizerts/results/push-project-through-group.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/push-project-through-group.plan
@@ -2,32 +2,31 @@
   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
     -- STREAM_PROJECT  |PARTITIONED|
       -- ASSIGN  |PARTITIONED|
-        -- STREAM_PROJECT  |PARTITIONED|
-          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-            -- PRE_CLUSTERED_GROUP_BY[$$15]  |PARTITIONED|
-                    {
-                      -- AGGREGATE  |LOCAL|
-                        -- STREAM_SELECT  |LOCAL|
-                          -- NESTED_TUPLE_SOURCE  |LOCAL|
-                    }
-              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                -- STABLE_SORT [$$15(ASC)]  |PARTITIONED|
-                  -- HASH_PARTITION_EXCHANGE [$$15]  |PARTITIONED|
-                    -- STREAM_PROJECT  |PARTITIONED|
-                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                        -- HYBRID_HASH_JOIN [$$17][$$16]  |PARTITIONED|
-                          -- HASH_PARTITION_EXCHANGE [$$17]  |PARTITIONED|
-                            -- STREAM_PROJECT  |PARTITIONED|
-                              -- ASSIGN  |PARTITIONED|
+        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$12]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- STREAM_SELECT  |LOCAL|
+                        -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STABLE_SORT [$$12(ASC)]  |PARTITIONED|
+                -- HASH_PARTITION_EXCHANGE [$$12]  |PARTITIONED|
+                  -- STREAM_PROJECT  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- HYBRID_HASH_JOIN [$$15][$$14]  |PARTITIONED|
+                        -- HASH_PARTITION_EXCHANGE [$$15]  |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 [$$14]  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
                                 -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                   -- DATASOURCE_SCAN  |PARTITIONED|
                                     -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                       -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
-                          -- HASH_PARTITION_EXCHANGE [$$16]  |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|