[NO ISSUE] Improve stability of window function tests

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Add ORDER BY to some window function tests to make their results deterministic

Change-Id: Ibf0858074a75d2169c1f1974585ce1c5ddb32b50
Reviewed-on: https://asterix-gerrit.ics.uci.edu/3104
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.82.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.82.query.sqlpp
index fc86522..e3421ec 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.82.query.sqlpp
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.82.query.sqlpp
@@ -24,5 +24,7 @@
 use test;
 
 FROM (SELECT VALUE tenk1 FROM tenk1 WHERE unique2 < 10 ORDER BY four, ten LIMIT 10) s
-SELECT last_value(ten) OVER (PARTITION BY four) AS `last_value`, ten, four
+SELECT
+  last_value(ten) OVER (PARTITION BY four ORDER BY ten ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS `last_value`,
+  ten, four
 ORDER BY four, ten;
\ No newline at end of file
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.83.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.83.query.sqlpp
index ea44416..2f854ce 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.83.query.sqlpp
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/window/pg_win/pg_win.83.query.sqlpp
@@ -24,7 +24,9 @@
 use test;
 
 FROM (SELECT VALUE tenk1 FROM tenk1 WHERE unique2 < 10 ORDER BY four, ten LIMIT 10) s
-SELECT nth_value(ten, four + 1) OVER (PARTITION BY four) AS `nth_value`, ten, four
+SELECT
+  nth_value(ten, four + 1) OVER (PARTITION BY four ORDER BY ten ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS `nth_value`,
+  ten, four
 ORDER BY four, ten