ASTERIXDB-865: fix query compilation for if-else expression.

Change-Id: I80e7995e814180fe567818263c79493901af284c
Reviewed-on: https://asterix-gerrit.ics.uci.edu/703
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>
diff --git a/asterix-app/src/test/resources/optimizerts/results/query-ASTERIXDB-865.plan b/asterix-app/src/test/resources/optimizerts/results/query-ASTERIXDB-865.plan
new file mode 100644
index 0000000..6ff5cee
--- /dev/null
+++ b/asterix-app/src/test/resources/optimizerts/results/query-ASTERIXDB-865.plan
@@ -0,0 +1,35 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- UNNEST  |PARTITIONED|
+            -- STREAM_PROJECT  |PARTITIONED|
+              -- UNNEST  |PARTITIONED|
+                -- STREAM_PROJECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- SUBPLAN  |PARTITIONED|
+                              {
+                                -- AGGREGATE  |LOCAL|
+                                  -- AGGREGATE  |LOCAL|
+                                    -- ASSIGN  |LOCAL|
+                                      -- UNNEST  |LOCAL|
+                                        -- ASSIGN  |LOCAL|
+                                          -- STREAM_SELECT  |LOCAL|
+                                            -- NESTED_TUPLE_SOURCE  |LOCAL|
+                              }
+                        -- SUBPLAN  |PARTITIONED|
+                                {
+                                  -- AGGREGATE  |LOCAL|
+                                    -- ASSIGN  |LOCAL|
+                                      -- ASSIGN  |LOCAL|
+                                        -- ASSIGN  |LOCAL|
+                                          -- STREAM_SELECT  |LOCAL|
+                                            -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                }
+                          -- ASSIGN  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- DATASOURCE_SCAN  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|