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https://issues.apache.org/jira/browse/HIVE-7219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prasanth J updated HIVE-7219:
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Attachment: HIVE-7219.4.patch
[~hagleitn] Thanks for taking a look at the failures. The file size changes are
because of the default encoding ("SPEED"). So we will see slight increase in
the file size. Regenerated the appropriate golden files. For the double
precision issue, it was because the double reader was not masking the first
byte that is read. Fixed them in this patch.
> Improve performance of serialization utils in ORC
> -------------------------------------------------
>
> Key: HIVE-7219
> URL: https://issues.apache.org/jira/browse/HIVE-7219
> Project: Hive
> Issue Type: Improvement
> Components: File Formats
> Affects Versions: 0.14.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Attachments: HIVE-7219.1.patch, HIVE-7219.2.patch, HIVE-7219.3.patch,
> HIVE-7219.4.patch, orc-read-perf-jmh-benchmark.png
>
>
> ORC uses serialization utils heavily for reading and writing data. The
> bitpacking and unpacking code in writeInts() and readInts() can be unrolled
> for better performance. Also double reader/writer performance can be improved
> by bulk reading/writing from/to byte array.
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