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author | Reynold Xin <rxin@databricks.com> | 2015-07-31 23:55:16 -0700 |
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committer | Reynold Xin <rxin@databricks.com> | 2015-07-31 23:55:16 -0700 |
commit | d90f2cf7a2a1d1e69f9ab385f35f62d4091b5302 (patch) | |
tree | 94dff8456047924b32f7295dca1e7f47702d5e16 /dev | |
parent | 67ad4e21fc68336b0ad6f9a363fb5ebb51f592bf (diff) | |
download | spark-d90f2cf7a2a1d1e69f9ab385f35f62d4091b5302.tar.gz spark-d90f2cf7a2a1d1e69f9ab385f35f62d4091b5302.tar.bz2 spark-d90f2cf7a2a1d1e69f9ab385f35f62d4091b5302.zip |
[SPARK-9517][SQL] BytesToBytesMap should encode data the same way as UnsafeExternalSorter
BytesToBytesMap current encodes key/value data in the following format:
```
8B key length, key data, 8B value length, value data
```
UnsafeExternalSorter, on the other hand, encodes data this way:
```
4B record length, data
```
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:
```
4B key+value length, 4B key length, key data, value data
```
Author: Reynold Xin <rxin@databricks.com>
Closes #7845 from rxin/kvsort-rebase and squashes the following commits:
5716b59 [Reynold Xin] Fixed test.
2e62ccb [Reynold Xin] Updated BytesToBytesMap's data encoding to put the key first.
a51b641 [Reynold Xin] Added a KV sorter interface.
Diffstat (limited to 'dev')
0 files changed, 0 insertions, 0 deletions