Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17931
at the time we received `SQLMetrics` in `SQLListener` with task end event,
the registered accumulator may already be GCed, then there is no way to
retrieve the accumulator names, except we sending accumulator names to executor
side, so that when executor can send back accumulators to driver side with
names.
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