Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/15789
There occurs four `randomized aggregation test`s failures due to
`OutOfMemoryError`. But, it seems to be irrelevant. I'll wait the next test
running currently.
```
[info] - randomized aggregation test - [typed, with partial + safe] - with
grouping keys - with non-empty input *** FAILED *** (1 second, 512 milliseconds)
[info] org.apache.spark.SparkException: Job aborted due to stage failure:
Task 4 in stage 1897.0 failed 1 times, most recent failure: Lost task 4.0 in
stage 1897.0 (TID 6408, localhost, executor driver):
java.lang.OutOfMemoryError: Java heap space
```
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