Yin Huai created SPARK-9611:
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Summary:
UnsafeFixedWidthAggregationMap.destructAndCreateExternalSorter will add an
empty entry to if the map is empty.
Key: SPARK-9611
URL: https://issues.apache.org/jira/browse/SPARK-9611
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Yin Huai
Assignee: Yin Huai
Priority: Blocker
There are a few corner cases related to the destructAndCreateExternalSorter
(class UnsafeKVExternalSorter) returned by UnsafeFixedWidthAggregationMap.
1. The constructor of UnsafeKVExternalSorter tries to first create a
UnsafeInMemorySorter based on the BytesToBytesMap of
UnsafeFixedWidthAggregationMap. However, when there is no entry in the map,
UnsafeInMemorySorter will throw an AssertionError because we are using the size
of map (0 at here) as the initialSize of UnsafeInMemorySorter, which is not
allowed.
2. Once we fixes the first problem, when we use UnsafeKVExternalSorter's
KVSorterIterator loads data back, you can find there is one extra records,
which is an empty record.
3. The next method of the KVSorterIterator in UnsafeKVExternalSorter does not
handle empty records well. If the length of a record is 0, the calculated
length of value will be -4, which causes a NegativeArraySizeException.
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