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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14908) Upgrade ANTLR to 3.5.2
Date Fri, 07 Oct 2016 06:24:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-14908:
-----------------------------------
    Attachment: HIVE-14908.01.patch

> Upgrade ANTLR to 3.5.2
> ----------------------
>
>                 Key: HIVE-14908
>                 URL: https://issues.apache.org/jira/browse/HIVE-14908
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-14908.01.patch
>
>
> Antlr v4 is also available but it does not support "->" which is widely used in our
grammar. Antlr 3.5.2 is the latest v3 version. It will reduce the code size:
> {code}
> Here is summary of current parser code size
> 422345  HiveLexer.java
> 2436601  HiveParser.java
> 814184  HiveParser_FromClauseParser.java
> 2705920  HiveParser_IdentifiersParser.java
> 777665 HiveParser_SelectClauseParser.java
>    After change, it will become
> 319589 HiveLexer.java
> 1853104 HiveParser.java
> 574156 HiveParser_FromClauseParser.java
> 1799195 HiveParser_IdentifiersParser.java
> 587305 HiveParser_SelectClauseParser.java
> {code}



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