iDeleteReq的prepare

fielddb/field_db.cpp

@@ -229,7 +229,7 @@ Status FieldDB::CreateIndexOnField(const std::string& field_name) {
     std::string Field = field_name;
     iCreateReq req(&Field,&mutex_);
     HandleRequest(req);
-    //如果已经存在索引，那么可以直接返回
+    //如果已经存在索引，那么直接返回
     if(req.Existed) {
         return req.s;
     }

fielddb/request.cpp

@@ -141,6 +141,14 @@ void iDeleteReq::Prepare(FieldDB *DB) {
         s = Status::OK();
         return ;
     }
+    auto [istatus,parent] = DB->index_[*Field];
+    if(istatus == FieldDB::Exist) {
+        DB->index_[*Field] = {FieldDB::Creating,this};
+        done = true;
+    } else {
+        //如果正在创建或者删除，那么pend到对应的请求上
+        parent->PendReq(this);
+    }
 }
 
 void iDeleteReq::ConstructBatch(WriteBatch &KVBatch,WriteBatch &IndexBatch,