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Posted to issues@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/07/11 00:06:00 UTC

[jira] [Created] (IMPALA-9948) Consider supporting correlated subqueries without equi-join predicates

Tim Armstrong created IMPALA-9948:
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             Summary: Consider supporting correlated subqueries without equi-join predicates
                 Key: IMPALA-9948
                 URL: https://issues.apache.org/jira/browse/IMPALA-9948
             Project: IMPALA
          Issue Type: New Feature
          Components: Frontend
            Reporter: Tim Armstrong


The Nested loop join supports a variety of join modes and we could rewrite more subqueries into nested loop joins. The downside is that the performance could be very poor in many cases



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