Modify all the plans to use ONE_TO_ONE_EXCHANGE for result distribution operator.
diff --git a/asterix-app/src/test/resources/optimizerts/results/btree-index/btree-secondary-38.plan b/asterix-app/src/test/resources/optimizerts/results/btree-index/btree-secondary-38.plan
index 2110116..ef8a923 100644
--- a/asterix-app/src/test/resources/optimizerts/results/btree-index/btree-secondary-38.plan
+++ b/asterix-app/src/test/resources/optimizerts/results/btree-index/btree-secondary-38.plan
@@ -1,5 +1,5 @@
 -- DISTRIBUTE_RESULT  |PARTITIONED|
-  -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
     -- STREAM_SELECT  |PARTITIONED|
       -- STREAM_PROJECT  |PARTITIONED|
         -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|