Fix for issue 813 - enabling prefix btree search with non-matching predicates

Change-Id: I59eb43afa7dbcabd7f43269566d75c9361c55386
Reviewed-on: http://fulliautomatix.ics.uci.edu:8443/171
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: abdullah alamoudi <bamousaa@gmail.com>
diff --git a/asterix-app/src/test/resources/optimizerts/queries/btree-index/btree-secondary-44.aql b/asterix-app/src/test/resources/optimizerts/queries/btree-index/btree-secondary-44.aql
index 54e149e..7e8bcc6 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/btree-index/btree-secondary-44.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/btree-index/btree-secondary-44.aql
@@ -1,11 +1,13 @@
 /*
  *  Description     : BTree Index verification test
- *                  : This test is intended to verify that the secondary BTree index is NOT used 
+ *                  : This test is intended to verify that the secondary BTree index is used 
  *                  : in the optimized query plan.
  *  Expected Result : Success
  *  Date            : 13th Aug 2012
  */
 
+// Positive test - prefix search
+
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
@@ -23,5 +25,5 @@
 create index sec_Idx on testdst(fname,lname);
 
 for $emp in dataset('testdst') 
-where $emp.fname >= "Michael" and $emp.lname <= "Xu"
+where $emp.fname > "Allan" and $emp.lname = "Xu"
 return $emp