Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13701
@davies Due to the accumulators for vectorized setting "true" and "false"
are with the same names "numRowGroups", the API looking for the accumulator
will return one among them. So the test becomes unstable. By removing it from
`AccumulatorContext` at the end of test, it should solve this problem.
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