Github user viirya commented on the issue:
https://github.com/apache/spark/pull/16232
@davies Yes, that is an extreme case. I use it to explain how we can cause
the exception.
Even we don't consider the extreme case if we don't pass the kind of map
in, the original assert `map.numKeys() <= map.getArray().size() / 2` looks
problematic. If each key has different value, as a key/value pair occupied two
spaces in the array, I think the assert for the array space should be
`map.numKeys() * 2 <= map.getArray().size() / 2`.
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