Github user cxzl25 commented on the issue:
https://github.com/apache/spark/pull/21311
@cloud-fan
LongToUnsafeRowMap#append(key: Long, row: UnsafeRow)
when row.getSizeInBytes > newPageSize( oldPage.length * 8L * 2),still use
newPageSize value.
When the new page size is insufficient to hold the entire row of data,
Platform.copyMemory is still called.No error.
At this time, the last remaining data was discarded.
When reading data, read this buffer according to offset and length,the last
data is unpredictable.
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