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Posted to issues@arrow.apache.org by "Ji Liu (JIRA)" <ji...@apache.org> on 2019/04/28 03:23:00 UTC
[jira] [Created] (ARROW-5225) [Java] Improve performance of
BaseValueVector#getValidityBufferSizeFromCount
Ji Liu created ARROW-5225:
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Summary: [Java] Improve performance of BaseValueVector#getValidityBufferSizeFromCount
Key: ARROW-5225
URL: https://issues.apache.org/jira/browse/ARROW-5225
Project: Apache Arrow
Issue Type: Improvement
Reporter: Ji Liu
Assignee: Ji Liu
Now in _BaseValueVector#getValidityBufferSizeFromCount_ and _BitVectorHelper#getValidityBufferSize_, it uses _Math.ceil_ to calculate size which is not efficient (lots of unnecessary logic in _StrictMath#floorOrCeil_) . Since the valueCount is always not less than 0, we could simply replace _Math.ceil_ with the following code:
_return valueCount % 8 > 0 ? valueCount / 8 + 1 : valueCount / 8_;
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