Panagiotis Garefalakis created ORC-595:
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Summary: Optimize Decimal64 scale calculation
Key: ORC-595
URL: https://issues.apache.org/jira/browse/ORC-595
Project: ORC
Issue Type: Improvement
Components: encoding
Reporter: Panagiotis Garefalakis
Assignee: Panagiotis Garefalakis
Currently Decimal64 is using an inner loop to apply the correct scale to each
read Long value
[https://github.com/apache/orc/blob/master/java/core/src/java/org/apache/orc/impl/TreeReaderFactory.java#L1294]
A more efficient way would be to apply the scale using a single array access
and by multiplying by 10 in the power of (scale - scratchScaleVector[r]).
An extra optimization would be to keep all powers of 10 (up to 18) in a static
array and reuse it across runtime instead of calculating each time.
cc: [~rameshkumar] [~gopalv]
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