record incorrect result for MDEV-5539 Empty results in UNION with Sphinx engine

(just to have the test in the tree when we merge the upstream fix)

mysql-test/suite/sphinx/union-5539.result

+create table ts (id bigint unsigned not null, w int not null, query varchar(255) not null, index(query)) engine=sphinx connection="sphinx://127.0.0.1:16002/*";
+SELECT a.* FROM (SELECT * FROM ts si WHERE si.query=';mode=extended2;limit=1000000;maxmatches=500') AS a UNION SELECT b.* FROM (SELECT * FROM ts si WHERE si.query='@* 123nothingtofind123;mode=extended2;limit=1000000;maxmatches=500') AS b;
+id	w	query
+SELECT a.* FROM (SELECT * FROM ts si WHERE si.query='@* 123nothingtofind123;mode=extended2;limit=1000000;maxmatches=500') AS a UNION SELECT b.* FROM (SELECT * FROM ts si WHERE si.query=';mode=extended2;limit=1000000;maxmatches=500') AS b;
+id	w	query
+1	1	;mode=extended2;limit=1000000;maxmatches=500
+2	1	;mode=extended2;limit=1000000;maxmatches=500
+3	1	;mode=extended2;limit=1000000;maxmatches=500
+4	1	;mode=extended2;limit=1000000;maxmatches=500
+drop table ts;

mysql-test/suite/sphinx/union-5539.test

+#
+# MDEV-5539 Empty results in UNION with Sphinx engine
+#
+eval create table ts (id bigint unsigned not null, w int not null, query varchar(255) not null, index(query)) engine=sphinx connection="sphinx://127.0.0.1:$SPHINXSEARCH_PORT/*";
+let $q1=SELECT * FROM ts si WHERE si.query=';mode=extended2;limit=1000000;maxmatches=500';
+let $q2=SELECT * FROM ts si WHERE si.query='@* 123nothingtofind123;mode=extended2;limit=1000000;maxmatches=500';
+########################
+# BUG BUG BUG !!!
+# Note, the result below is incorrect! It should be updated when
+# MDEV-5539 is fixed upstream!!!
+########################
+eval SELECT a.* FROM ($q1) AS a UNION SELECT b.* FROM ($q2) AS b;
+eval SELECT a.* FROM ($q2) AS a UNION SELECT b.* FROM ($q1) AS b;
+drop table ts;
+