Github user liutang123 commented on the issue:
https://github.com/apache/spark/pull/21772
@viirya This case occurred in our cluster and we took a lot of time to
find this bug.
For some man-made reasons, the small table's max id has become abnormally
large. The LongHasedRelation generated based on the table was not optimized to
`dense` and has become abnormally big(approximately 400MB).
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