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From "Samuel Yuan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-4067) Followup to HIVE-701: reduce ambiguity in grammar
Date Fri, 22 Feb 2013 22:48:12 GMT
Samuel Yuan created HIVE-4067:
---------------------------------

             Summary: Followup to HIVE-701: reduce ambiguity in grammar
                 Key: HIVE-4067
                 URL: https://issues.apache.org/jira/browse/HIVE-4067
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
            Reporter: Samuel Yuan
            Assignee: Samuel Yuan
            Priority: Minor


After HIVE-701 the grammar has become much more ambiguous, and the compilation generates a
large number of warnings. Making FROM, DISTINCT, PRESERVE, COLUMN, ALL, AND, OR, and NOT reserved
keywords again reduces the number of warnings to 134, up from the original 81 warnings but
down from the 565 after HIVE-701. Most of the remaining ambiguity is trivial, an example being
"KW_ELEM_TYPE | KW_KEY_TYPE | KW_VALUE_TYPE | identifier", and they are all correctly handled
by ANTLR.

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