question about drill push down

[马云]

Hi  Drill dev,


I want to use drill in our project. and I face diffcult issues.
As you know, it can pushdown filter operation to scan in the storageplugin


such as in  HBaseStoragePlugin.java


  @Override
  public Set<StoragePluginOptimizerRule> 
getPhysicalOptimizerRules(OptimizerRulesContext optimizerRulesContext) {
    return ImmutableSet.of(HBasePushFilterIntoScan.FILTER_ON_SCAN, 
HBasePushFilterIntoScan.FILTER_ON_PROJECT);
  }




My question:  I want to develop an customized storageplugin, I hope to push 
down "group by" to scan. Is there any way to do it?
                    Please give advice, thanks very much!




thanks
Yun