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Posted to issues-all@impala.apache.org by "Zoltán Borók-Nagy (Jira)" <ji...@apache.org> on 2021/09/06 09:37:00 UTC
[jira] [Created] (IMPALA-10903) Do a PARTITIONED ANTI HASH JOIN
when there are lots of deleted rows
Zoltán Borók-Nagy created IMPALA-10903:
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Summary: Do a PARTITIONED ANTI HASH JOIN when there are lots of deleted rows
Key: IMPALA-10903
URL: https://issues.apache.org/jira/browse/IMPALA-10903
Project: IMPALA
Issue Type: Sub-task
Components: Frontend
Reporter: Zoltán Borók-Nagy
Impala currently always does a BROADCAST join between base/delta files and delete delta files:
[https://github.com/apache/impala/blob/45d3eddc056bc28ee43efa6307cd673062936a41/fe/src/main/java/org/apache/impala/planner/SingleNodePlanner.java#L1726]
When there are lots of deleted rows a PARTITIONED hash join can be more efficient.
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