SQL++ support in AsterixDB:
1. implemented SQL++ expression to logical plan translator;
2. refactored REST API to be agnostic of query languages;
3. disabled fuzzy join queries for SQL++ runtime tests;
4. fixed several rewriting rules.

Change-Id: I82919c4527b304325059519d819a2c30cf2902a9
Reviewed-on: https://asterix-gerrit.ics.uci.edu/479
Reviewed-by: Till Westmann <tillw@apache.org>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterix-app/src/test/resources/optimizerts/results/skip-index/dont-skip-primary-index-search-in-delete.plan b/asterix-app/src/test/resources/optimizerts/results/skip-index/dont-skip-primary-index-search-in-delete.plan
index e2e6dff..bc9f1d1 100644
--- a/asterix-app/src/test/resources/optimizerts/results/skip-index/dont-skip-primary-index-search-in-delete.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/skip-index/dont-skip-primary-index-search-in-delete.plan
@@ -7,9 +7,8 @@
             -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
               -- ASSIGN  |PARTITIONED|
                 -- STREAM_PROJECT  |PARTITIONED|
-                  -- ASSIGN  |PARTITIONED|
-                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                      -- BTREE_SEARCH  |PARTITIONED|
-                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                          -- ASSIGN  |PARTITIONED|
-                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- BTREE_SEARCH  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- ASSIGN  |PARTITIONED|
+                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-ngram-index-search-in-delete.plan b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-ngram-index-search-in-delete.plan
index c882d81..31de832 100644
--- a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-ngram-index-search-in-delete.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-ngram-index-search-in-delete.plan
@@ -11,11 +11,9 @@
                     -- MATERIALIZE  |PARTITIONED|
                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                         -- ASSIGN  |PARTITIONED|
-                          -- STREAM_PROJECT  |PARTITIONED|
-                            -- ASSIGN  |PARTITIONED|
-                              -- STREAM_SELECT  |PARTITIONED|
-                                -- ASSIGN  |PARTITIONED|
+                          -- STREAM_SELECT  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- DATASOURCE_SCAN  |PARTITIONED|
                                   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                    -- DATASOURCE_SCAN  |PARTITIONED|
-                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-rtree-index-search-in-delete.plan b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-rtree-index-search-in-delete.plan
index b69dfa3..0c406e2 100644
--- a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-rtree-index-search-in-delete.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-rtree-index-search-in-delete.plan
@@ -13,11 +13,9 @@
                         -- MATERIALIZE  |PARTITIONED|
                           -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                             -- ASSIGN  |PARTITIONED|
-                              -- STREAM_PROJECT  |PARTITIONED|
-                                -- ASSIGN  |PARTITIONED|
-                                  -- STREAM_SELECT  |PARTITIONED|
-                                    -- ASSIGN  |PARTITIONED|
+                              -- STREAM_SELECT  |PARTITIONED|
+                                -- STREAM_PROJECT  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- DATASOURCE_SCAN  |PARTITIONED|
                                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                        -- DATASOURCE_SCAN  |PARTITIONED|
-                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
\ No newline at end of file
+                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-secondary-btree-index-search-in-delete.plan b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-secondary-btree-index-search-in-delete.plan
index c882d81..31de832 100644
--- a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-secondary-btree-index-search-in-delete.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-secondary-btree-index-search-in-delete.plan
@@ -11,11 +11,9 @@
                     -- MATERIALIZE  |PARTITIONED|
                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                         -- ASSIGN  |PARTITIONED|
-                          -- STREAM_PROJECT  |PARTITIONED|
-                            -- ASSIGN  |PARTITIONED|
-                              -- STREAM_SELECT  |PARTITIONED|
-                                -- ASSIGN  |PARTITIONED|
+                          -- STREAM_SELECT  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- DATASOURCE_SCAN  |PARTITIONED|
                                   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                    -- DATASOURCE_SCAN  |PARTITIONED|
-                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-word-index-search-in-delete.plan b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-word-index-search-in-delete.plan
index c882d81..31de832 100644
--- a/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-word-index-search-in-delete.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/skip-index/skip-word-index-search-in-delete.plan
@@ -11,11 +11,9 @@
                     -- MATERIALIZE  |PARTITIONED|
                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                         -- ASSIGN  |PARTITIONED|
-                          -- STREAM_PROJECT  |PARTITIONED|
-                            -- ASSIGN  |PARTITIONED|
-                              -- STREAM_SELECT  |PARTITIONED|
-                                -- ASSIGN  |PARTITIONED|
+                          -- STREAM_SELECT  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- DATASOURCE_SCAN  |PARTITIONED|
                                   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                    -- DATASOURCE_SCAN  |PARTITIONED|
-                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|