Fix a sporadic test failure (retrieving duplicate keys).

Duplicate keys are sorted by tuple pointer value.
This led to non-stable test output when retrieving
all duplicates.
Sort results in the test runner to avoid sporadic
errors.

test/box_big/sql.result

@@ -236,11 +236,11 @@ Found 5 tuples:
 [5, 'duplicate one']
 select * from t4 where k1='duplicate two'
 Found 5 tuples:
+[10, 'duplicate two']
 [6, 'duplicate two']
 [7, 'duplicate two']
 [8, 'duplicate two']
 [9, 'duplicate two']
-[10, 'duplicate two']
 select * from t4 where k1='duplicate three'
 Found 5 tuples:
 [11, 'duplicate three']

test/box_big/sql.test

@@ -131,9 +131,11 @@ exec sql "insert into t4 values (12, 'duplicate three')"
 exec sql "insert into t4 values (13, 'duplicate three')"
 exec sql "insert into t4 values (14, 'duplicate three')"
 exec sql "insert into t4 values (15, 'duplicate three')"
+sql.sort = True
 exec sql "select * from t4 where k1='duplicate one'"
 exec sql "select * from t4 where k1='duplicate two'"
 exec sql "select * from t4 where k1='duplicate three'"
+sql.sort = False
 exec sql "delete from t4 where k0=1"
 exec sql "delete from t4 where k0=2"
 exec sql "delete from t4 where k0=3"

test/lib/box_connection.py

@@ -27,6 +27,9 @@ import struct
 from tarantool_connection import TarantoolConnection
 
 class BoxConnection(TarantoolConnection):
+    def __init__(self, host, port):
+        super(BoxConnection, self).__init__(host, port)
+        self.sort = False
 
     def recvall(self, length):
         res = ""
@@ -42,6 +45,7 @@ class BoxConnection(TarantoolConnection):
         statement = sql.parse("sql", command)
         if statement == None:
             return "You have an error in your SQL syntax\n"
+        statement.sort = self.sort
 
         payload = statement.pack()
         header = struct.pack("<lll", statement.reqeust_type, len(payload), 0)

test/lib/sql_ast.py

@@ -299,6 +299,8 @@ class StatementSelect(StatementPing):
         while len(tuples) < tuple_count:
             (next_tuple, offset) = unpack_tuple(response, offset)
             tuples.append(next_tuple)
+        if self.sort:
+            tuples.sort()
         if tuple_count == 0:
             return "No match"
         elif tuple_count == 1:

test/lib/tarantool_connection.py

@@ -26,7 +26,7 @@ import sys
 import cStringIO
 import errno
 
-class TarantoolConnection:
+class TarantoolConnection(object):
     def __init__(self, host, port):
         self.host = host
         self.port = port