fix

docs/Parameters.rst

@@ -925,11 +925,11 @@ Dataset Parameters
 
    -  **Note**: index starts from ``0`` and it doesn't count the label column when passing type is ``int``, e.g. when label is column\_0 and query\_id is column\_1, the correct parameter is ``query=0``
 
-   -  ``position_column`` :raw-html:`<a id="group_column" title="Permalink to this parameter" href="#group_column">&#x1F517;&#xFE0E;</a>`, default = ``""``, type = int or string, aliases: ``position``, ``position_id``
+-  ``position_column`` :raw-html:`<a id="position_column" title="Permalink to this parameter" href="#position_column">&#x1F517;&#xFE0E;</a>`, default = ``""``, type = int or string, aliases: ``position``, ``position_id``, ``position_column``
 
-   -  used to specify the position id column
+   -  used to specify the position/position id column
 
-   -  use number for index, e.g. ``position=0`` means column\_0 is the position
+   -  use number for index, e.g. ``position=0`` means column\_0 is the position id
 
    -  add a prefix ``name:`` for column name, e.g. ``position=name:position_id``
 

src/io/config_auto.cpp

@@ -135,6 +135,7 @@ const std::unordered_map<std::string, std::string>& Config::alias_table() {
   {"query_id", "group_column"},
   {"position", "position_column"},
   {"position_id", "position_column"},
+  {"position_column", "position_column"},
   {"ignore_feature", "ignore_column"},
   {"blacklist", "ignore_column"},
   {"cat_feature", "categorical_feature"},
@@ -889,7 +890,7 @@ const std::unordered_map<std::string, std::vector<std::string>>& Config::paramet
     {"label_column", {"label"}},
     {"weight_column", {"weight"}},
     {"group_column", {"group", "group_id", "query_column", "query", "query_id"}},
-    {"position_column", {"position", "position_id"}},
+    {"position_column", {"position", "position_id", "position_column"}},
     {"ignore_column", {"ignore_feature", "blacklist"}},
     {"categorical_feature", {"cat_feature", "categorical_column", "cat_column", "categorical_features"}},
     {"forcedbins_filename", {}},

src/io/dataset_loader.cpp

@@ -1385,6 +1385,8 @@ void DatasetLoader::ExtractFeaturesFromMemory(std::vector<std::string>* text_dat
             dataset->metadata_.SetWeightAt(i, static_cast<label_t>(inner_data.second));
           } else if (inner_data.first == group_idx_) {
             dataset->metadata_.SetQueryAt(i, static_cast<data_size_t>(inner_data.second));
+          } else if (inner_data.first == position_idx_) {
+            dataset->metadata_.SetPositionAt(i, static_cast<data_size_t>(inner_data.second));
           }
         }
       }