remove unused objects

arangod/Aql/Expression.cpp

@@ -74,8 +74,7 @@ Expression::Expression(Ast* ast, AstNode* node)
       _isDeterministic(false),
       _hasDeterminedAttributes(false),
       _built(false),
-      _attributes(),
-      _buffer(TRI_UNKNOWN_MEM_ZONE) {
+      _attributes() {
   TRI_ASSERT(_ast != nullptr);
   TRI_ASSERT(_executor != nullptr);
   TRI_ASSERT(_node != nullptr);

arangod/Aql/Expression.h

@@ -388,9 +388,6 @@ class Expression {
   std::unordered_map<Variable const*, std::unordered_set<std::string>>
       _attributes;
 
-  /// @brief buffer for temporary strings
-  arangodb::basics::StringBuffer _buffer;
-
   /// @brief variables only temporarily valid during execution
   std::unordered_map<Variable const*, arangodb::velocypack::Slice> _variables;
 

arangod/Aql/ModificationBlocks.cpp

@@ -43,8 +43,7 @@ ModificationBlock::ModificationBlock(ExecutionEngine* engine,
       _outRegNew(ExecutionNode::MaxRegisterId),
       _collection(ep->_collection),
       _isDBServer(false),
-      _usesDefaultSharding(true),
-      _buffer(TRI_UNKNOWN_MEM_ZONE) {
+      _usesDefaultSharding(true) {
 
   _trx->orderDitch(_collection->cid());
 

arangod/Aql/ModificationBlocks.h

@@ -73,9 +73,6 @@ class ModificationBlock : public ExecutionBlock {
 
   /// @brief whether or not the collection uses the default sharding attributes
   bool _usesDefaultSharding;
-
-  /// @brief temporary string buffer for extracting system attributes
-  arangodb::basics::StringBuffer _buffer;
 };
 
 class RemoveBlock : public ModificationBlock {