[
https://issues.apache.org/jira/browse/HIVE-15743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Teddy Choi updated HIVE-15743:
------------------------------
Attachment: HIVE-15743.3.patch
This patch uses a byte array to skip encoding. When it gets a number with
shorter digits than 16, then it parses faster with double arithmetics.
Otherwise, it parses slower with Double.parseDouble. It also has unit tests and
a benchmark test.
> 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
> Assignee: Teddy Choi
> Attachments: HIVE-15743.1.patch, HIVE-15743.2.patch,
> HIVE-15743.3.patch, 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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
