[jira] [Updated] (HIVE-15743) vectorized text parsing: speed up double parse

["Teddy Choi (JIRA)" <ji...@apache.org>]

     [ 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.



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