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Posted to issues-all@impala.apache.org by "Vincent Tran (Jira)" <ji...@apache.org> on 2021/10/26 16:42:00 UTC
[jira] [Created] (IMPALA-10988) Clarify
DEFAULT_JOIN_DISTRIBUTION_MODE Query Option
Vincent Tran created IMPALA-10988:
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Summary: Clarify DEFAULT_JOIN_DISTRIBUTION_MODE Query Option
Key: IMPALA-10988
URL: https://issues.apache.org/jira/browse/IMPALA-10988
Project: IMPALA
Issue Type: Documentation
Components: Docs
Affects Versions: Not Applicable
Reporter: Vincent Tran
[https://impala.apache.org/docs/build/html/topics/impala_default_join_distribution_mode.html] states:
{noformat}
This option determines the join distribution that Impala uses when any of the tables involved in a join query is missing statistics.{noformat}
However, I think technically, it determines the join distribution when any input of a join has unknown cardinality. Missing statistics, currently, does not always cause unknown cardinality. So we need to correct this statement.
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