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https://issues.apache.org/jira/browse/SPARK-26001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuming Wang updated SPARK-26001:
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Affects Version/s: (was: 2.5.0)
3.0.0
> Reduce memory copy when writing decimal
> ---------------------------------------
>
> Key: SPARK-26001
> URL: https://issues.apache.org/jira/browse/SPARK-26001
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: caoxuewen
> Priority: Major
>
> this PR fix 2 here:
> - when writing non-null decimals, we not zero-out all the 16 allocated bytes.
> if the number of bytes needed for a decimal is greater than 8. then we not
> need zero-out between 0-byte and 8-byte. The first 8-byte will be covered
> when writing decimal.
> - when writing null decimals, we not zero-out all the 16 allocated bytes.
> BitSetMethods.set the label for null and the length of decimal to 0. when we
> get the decimal, will not access the 16 byte memory value, so this is safe.
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