David Mollitor created HIVE-23177:

             Summary: Upgrade to ANTLR4
                 Key: HIVE-23177
                 URL: https://issues.apache.org/jira/browse/HIVE-23177
             Project: Hive
          Issue Type: Improvement
            Reporter: David Mollitor

Upgrade Hive to ANTL4, ANTLR3 lost support many moons ago.

This is going to be a big lift.  Many of the Hive rules use the "rule rewrite" 
feature which no longer exists in ANLTR4 and it must be completely 


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