Reynold Xin created SPARK-9517:
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Summary: BytesToBytesMap should encode data the same way as
UnsafeExternalSorter
Key: SPARK-9517
URL: https://issues.apache.org/jira/browse/SPARK-9517
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Reynold Xin
Assignee: Reynold Xin
BytesToBytesMap current encodes key/value data in the following format:
{code}
8B key length, key data, 8B value length, value data
{code}
UnsafeExternalSorter, on the other hand, encodes data this way:
{code}
4B record length, data
{code}
As a result, we cannot pass records encoded by BytesToBytesMap directly into
UnsafeExternalSorter for sorting. However, if we rearrange data slightly, we
can then pass the key/value records directly into UnsafeExternalSorter:
{code}
4B key+value length, 4B key length, key data, value data
{code}
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