hadoop-hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-416) Get rid of backtrack in Hive.g
Date Fri, 17 Apr 2009 21:20:15 GMT

     [ https://issues.apache.org/jira/browse/HIVE-416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zheng Shao updated HIVE-416:
----------------------------

    Attachment: HIVE-416.1.2.patch

@Ashish:
This patch removes the unnecessary "{k=5}".
We cannot extract the common "SELECT" out because we allow "MAP", "REDUCE", as well as "SELECT
TRANSFORM" in the trfmClause.


> Get rid of backtrack in Hive.g
> ------------------------------
>
>                 Key: HIVE-416
>                 URL: https://issues.apache.org/jira/browse/HIVE-416
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.4.0
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>             Fix For: 0.4.0
>
>         Attachments: HIVE-416.1.1.patch, HIVE-416.1.2.patch, HIVE-416.1.patch
>
>
> Hive.g now still uses "backtrack=true". "backtrack" not only slows down the parsing in
case of error, it can also produce wrong syntax error messages (usually based on the last
try of the backtracking).
> We should follow http://www.antlr.org/wiki/display/ANTLR3/How+to+remove+global+backtracking+from+your+grammar
to remove the need of doing backtrack.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message