exact tree training does not seem to colsample bynode

[oOTWK]

https://github.com/dmlc/xgboost/blob/master/src/tree/updater_colmaker.cc#L477
FindSplit() enumerates all splits of all nodes in the same depth in parallel. In this function, column_sampler_->GetFeatureSet(depth); is only called once at the beginning. Then, wouldn't it use the same set of features per depth?

[trivialfis]

Thank you for looking into it, we will explicitly disable the feature for the exact method for now and refine the implementation in later releases.

[oOTWK]

Thank you for your support always!