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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-416) Get rid of backtrack in Hive.g
Date Wed, 15 Apr 2009 07:08:14 GMT
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

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.

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