adding skipSome method for GatherBlock.

arangod/Aql/ExecutionBlock.cpp

@@ -3543,6 +3543,28 @@ AqlItemBlock* GatherBlock::getSome (size_t atLeast, size_t atMost) {
 
 }
 
+size_t GatherBlock::skipSome (size_t atLeast, size_t atMost) {
+  
+  if (_done) {
+    return 0;
+  }
+  
+  if (isSimple()) {
+    auto res = _dependencies.at(_atDep)->skipSome(atLeast, atMost);
+    while (res == 0 && _atDep < _dependencies.size() - 1) {
+      _atDep++;
+      res = _dependencies.at(_atDep)->skipSome(atLeast, atMost);
+    }
+    if (res == 0) {
+      _done = true;
+    }
+    return res;
+  //} else { // merge sort the results from the deps
+
+  }
+  return 0; // to keep the compiler happy
+
+}
 // Local Variables:
 // mode: outline-minor
 // outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"

arangod/Aql/ExecutionBlock.h

@@ -1515,14 +1515,10 @@ public:
 
         AqlItemBlock* getSome (size_t, size_t);
 
+        size_t skipSome (size_t, size_t);
+
       private:
 
-        /*int getOrSkipSome (size_t atLeast,
-                           size_t atMost,
-                           bool skipping,
-                           AqlItemBlock*& result,
-                           size_t& skipped);*/
-        
         // the block is simple if we do not do merge sort . . .
         bool isSimple () {
           auto en = static_cast<GatherNode const*>(getPlanNode());