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https://issues.apache.org/jira/browse/HIVE-15743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15840937#comment-15840937
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Sergey Shelukhin edited comment on HIVE-15743 at 1/27/17 4:21 AM:
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cc [~mmccline]
We can probably just c/p parts of FloatingDecimal - merge the parsing and
doubleValue, and change them to operate on byte array. It only needs to
recognize like 6-8 letters aside from normal numeric stuff (nan and infinity
aside), so we should be safe since we always use utf8
was (Author: sershe):
cc [~mmccline]
We can probably just c/p parts of FloatingDecimal - merge the parsing and
doubleValue, and change them to operate on byte array. It only needs to
recognize like 6-8 letters aside from normal numeric stuff (nan and infinity
aside), so we should be safe since we always use utf8
> vectorized text parsing: speed up double parse
> ----------------------------------------------
>
> Key: HIVE-15743
> URL: https://issues.apache.org/jira/browse/HIVE-15743
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Attachments: tpch-without.png
>
>
> {noformat}
> Double.parseDouble(
> new String(bytes, fieldStart, fieldLength,
> StandardCharsets.UTF_8));{noformat}
> This takes ~25% of the query time in some cases.
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