[warm restart assist] assume vector values could be reordered (#921)

When comparing 2 vectors, assume their elements could be re-ordered.

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

warmrestart/warmRestartAssist.cpp

@@ -1,4 +1,5 @@
 #include <string>
+#include <algorithm>
 #include "logger.h"
 #include "schema.h"
 #include "warm_restart.h"
@@ -173,7 +174,7 @@ void AppRestartAssist::insertToMap(string key, vector<FieldValueTuple> fvVector,
     else if (found != appTableCacheMap.end())
     {
         // check only the original vector range (exclude cache-state field/value)
-        if(!equal(fvVector.begin(), fvVector.end(), found->second.begin()))
+        if(! contains(found->second, fvVector))
         {
             SWSS_LOG_NOTICE("%s, found key: %s, new value ", m_appTableName.c_str(), key.c_str());
 
@@ -280,3 +281,18 @@ bool AppRestartAssist::checkReconcileTimer(Selectable *s)
     }
     return false;
 }
+
+// check if left vector contains all elements of right vector
+bool AppRestartAssist::contains(const std::vector<FieldValueTuple>& left,
+              const std::vector<FieldValueTuple>& right)
+{
+    for (auto const& rv : right)
+    {
+        if (std::find(left.begin(), left.end(), rv) == left.end())
+        {
+            return false;
+        }
+    }
+
+    return true;
+}

warmrestart/warmRestartAssist.h

@@ -115,6 +115,8 @@ class AppRestartAssist
     std::string joinVectorString(const std::vector<FieldValueTuple> &fv);
     void setCacheEntryState(std::vector<FieldValueTuple> &fvVector, cache_state_t state);
     cache_state_t getCacheEntryState(const std::vector<FieldValueTuple> &fvVector);
+    bool contains(const std::vector<FieldValueTuple>& left,
+                  const std::vector<FieldValueTuple>& right);
 };
 
 }