[SPARK-24795][CORE][FOLLOWUP] Combine BarrierTaskContext with BarrierTaskContextImpl #21972
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What changes were proposed in this pull request?
According to #21758 (comment) , current declaration of
BarrierTaskContextdidn't extend methods fromTaskContext. SinceTaskContextis an abstract class and we don't want to change it to a trait, we have to define classBarrierTaskContextdirectly.How was this patch tested?
Existing tests.