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Date: Wed, 4 May 2016 08:42:12 +0000 (UTC)
From: "Gopal V (JIRA)" <jira@apache.org>
To: issues@hive.apache.org
Message-ID: <JIRA.12964903.1462347749000.106478.1462351332975@Atlassian.JIRA>
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Subject: [jira] [Updated] (HIVE-13685) Vectorization: Date*ColScalar parses
 the scalar in every loop
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archived-at: Wed, 04 May 2016 08:54:24 -0000


     [ https://issues.apache.org/jira/browse/HIVE-13685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V updated HIVE-13685:
---------------------------
    Assignee: Nita Dembla

> Vectorization: Date*ColScalar parses the scalar in every loop
> -------------------------------------------------------------
>
>                 Key: HIVE-13685
>                 URL: https://issues.apache.org/jira/browse/HIVE-13685
>             Project: Hive
>          Issue Type: Improvement
>          Components: Vectorization
>    Affects Versions: 2.1.0
>            Reporter: Gopal V
>            Assignee: Nita Dembla
>         Attachments: HIVE-13685.WIP.patch
>
>
> {code}
> @Override
>   public void evaluate(VectorizedRowBatch batch) {
> ...
> switch (inputTypes[0]) {
> ...
>       case STRING:
>       case CHAR:
>       case VARCHAR:
>         try {
>           baseDate = formatter.parse(new String(stringValue, "UTF-8"));
>           break;
> {code}
> This is parsing the constant scalar for every evaluate() call.
> Parsing the constant in the initialize op will save thousands of expensive calls into Calendar operations.


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