Add latch='0' test for completeness'

mysql-test/suite/oqgraph/basic.result

@@ -46,7 +46,7 @@ NULL	12	10	1	NULL	NULL
 SELECT count(*) FROM graph;
 count(*)
 13
-# Return all edges when latch is NULL
+# Return all edges when latch is NULL - this is different to latch='' and same as no where clause
 SELECT * FROM graph where latch is NULL;
 latch	origid	destid	weight	seq	linkid
 NULL	1	2	1	NULL	NULL
@@ -76,6 +76,19 @@ latch	origid	destid	weight	seq	linkid
 	NULL	NULL	NULL	NULL	10
 	NULL	NULL	NULL	NULL	11
 	NULL	NULL	NULL	NULL	12
+SELECT * FROM graph where latch='0';
+latch	origid	destid	weight	seq	linkid
+0	NULL	NULL	NULL	NULL	1
+0	NULL	NULL	NULL	NULL	2
+0	NULL	NULL	NULL	NULL	3
+0	NULL	NULL	NULL	NULL	4
+0	NULL	NULL	NULL	NULL	5
+0	NULL	NULL	NULL	NULL	6
+0	NULL	NULL	NULL	NULL	7
+0	NULL	NULL	NULL	NULL	9
+0	NULL	NULL	NULL	NULL	10
+0	NULL	NULL	NULL	NULL	11
+0	NULL	NULL	NULL	NULL	12
 # Currently count should be 11
 SELECT count(*) FROM graph where latch='';
 count(*)

mysql-test/suite/oqgraph/basic.test

@@ -67,12 +67,15 @@ SELECT * FROM graph;
 --echo # Currently count should be 13
 SELECT count(*) FROM graph;
 
---echo # Return all edges when latch is NULL
+--echo # Return all edges when latch is NULL - this is different to latch='' and same as no where clause
 SELECT * FROM graph where latch is NULL;
 
 --echo # Return all vertices, and subsets of vertices
 SELECT * FROM graph where latch='';
+SELECT * FROM graph where latch='0';
+
 --echo # Currently count should be 11
+
 SELECT count(*) FROM graph where latch='';
 #-- get a subset of vertices
 SELECT * FROM graph where latch='' and linkid = 2;