Fix arbitrary order issues

Simply added some ORDER BYs.

src/test/regress/expected/multi_router_planner.out

@@ -757,33 +757,35 @@ DEBUG:  Plan is router executable
 SELECT id
 	FROM articles_hash
 	WHERE author_id = 1
-	GROUP BY id;
+	GROUP BY id
+	ORDER BY id;
 DEBUG:  predicate pruning for shardId 840001
 DEBUG:  Creating router plan
 DEBUG:  Plan is router executable
  id 
 ----
- 41
- 11
- 31
   1
+ 11
  21
+ 31
+ 41
 (5 rows)
 
 -- single shard select with distinct is router plannable
-SELECT distinct id
+SELECT DISTINCT id
 	FROM articles_hash
-	WHERE author_id = 1;
+	WHERE author_id = 1
+	ORDER BY id;
 DEBUG:  predicate pruning for shardId 840001
 DEBUG:  Creating router plan
 DEBUG:  Plan is router executable
  id 
 ----
- 41
- 11
- 31
   1
+ 11
  21
+ 31
+ 41
 (5 rows)
 
 -- single shard aggregate is router plannable

src/test/regress/expected/multi_simple_queries.out

@@ -494,17 +494,18 @@ DEBUG:  Plan is router executable
 SELECT id
 	FROM articles
 	WHERE author_id = 1
-	GROUP BY id;
+	GROUP BY id
+	ORDER BY id;
 DEBUG:  predicate pruning for shardId 850001
 DEBUG:  Creating router plan
 DEBUG:  Plan is router executable
  id 
 ----
- 41
- 11
- 31
   1
+ 11
  21
+ 31
+ 41
 (5 rows)
 
 -- copying from a single shard table does not require the master query

src/test/regress/sql/multi_router_planner.sql

@@ -334,12 +334,14 @@ SELECT *
 SELECT id
 	FROM articles_hash
 	WHERE author_id = 1
-	GROUP BY id;
+	GROUP BY id
+	ORDER BY id;
 
 -- single shard select with distinct is router plannable
-SELECT distinct id
+SELECT DISTINCT id
 	FROM articles_hash
-	WHERE author_id = 1;
+	WHERE author_id = 1
+	ORDER BY id;
 
 -- single shard aggregate is router plannable
 SELECT avg(word_count)

src/test/regress/sql/multi_simple_queries.sql

@@ -260,7 +260,8 @@ SELECT *
 SELECT id
 	FROM articles
 	WHERE author_id = 1
-	GROUP BY id;
+	GROUP BY id
+	ORDER BY id;
 
 -- copying from a single shard table does not require the master query
 COPY articles_single_shard TO stdout;