Get rid of backtrack in Hive.g
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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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