Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/1045#discussion_r156186386
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/ops/BaseOperatorContext.java 
---
    @@ -39,27 +39,29 @@
      * version of the operator context and the full production-time context
      * that includes network services.
      */
    -
     public abstract class BaseOperatorContext implements OperatorContext {
       static final org.slf4j.Logger logger = 
org.slf4j.LoggerFactory.getLogger(BaseOperatorContext.class);
     
    -  protected final FragmentContextInterface context;
    +  protected final FragmentContext context;
       protected final BufferAllocator allocator;
       protected final PhysicalOperator popConfig;
       protected final BufferManager manager;
    +  protected OperatorStatReceiver statsWriter;
       private DrillFileSystem fs;
       private ControlsInjector injector;
     
    -  public BaseOperatorContext(FragmentContextInterface context, 
BufferAllocator allocator,
    -               PhysicalOperator popConfig) {
    +  public BaseOperatorContext(FragmentContext context, BufferAllocator 
allocator,
    +                             PhysicalOperator popConfig,
    +                             OperatorStatReceiver stats) {
         this.context = context;
         this.allocator = allocator;
         this.popConfig = popConfig;
         this.manager = new BufferManagerImpl(allocator);
    +    this.statsWriter = stats;
    --- End diff --
    
    This member was removed in a recent commit. Since the test and production 
versions need different implementation, the derived classes manage the operator 
stats.


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