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Posted to dev@hive.apache.org by "Zoltan Haindrich (JIRA)" <ji...@apache.org> on 2019/07/10 07:59:00 UTC

[jira] [Created] (HIVE-21980) Parsing time can be high in case of deeply nested subqueries

Zoltan Haindrich created HIVE-21980:
---------------------------------------

             Summary: Parsing time can be high in case of deeply nested subqueries
                 Key: HIVE-21980
                 URL: https://issues.apache.org/jira/browse/HIVE-21980
             Project: Hive
          Issue Type: Improvement
          Components: Parser
            Reporter: Zoltan Haindrich
            Assignee: Zoltan Haindrich
         Attachments: HIVE-21980.01.patch

for queries which are recursively doing:

{code}
SELECT ...
FROM (SELECT ...
             FROM ( [...]
             ) JOIN
            (SELECT ...
            FROM ( [...] )
JOIN ( [...]
)
{code}



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