Sergey Shelukhin created HIVE-15932:
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             Summary: add "explain ast"
                 Key: HIVE-15932
                 URL: https://issues.apache.org/jira/browse/HIVE-15932
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin


AST was removed in explain extended in HIVE-13533; that makes sense from users 
perspective for the common case, but it would be useful for Hive developers and 
advanced users to see the AST to diagnose issues. "Explain ast" command can be 
added to dump the AST.



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