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https://issues.apache.org/jira/browse/HIVE-28333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Soumyakanti Das resolved HIVE-28333.
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Fix Version/s: 4.1.0
Resolution: Fixed
> Skip CBO for UNIQUEJOIN and TABLESAMPLE
> ---------------------------------------
>
> Key: HIVE-28333
> URL: https://issues.apache.org/jira/browse/HIVE-28333
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Reporter: Soumyakanti Das
> Assignee: Soumyakanti Das
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> CBO doesn't support TABLESAMPLE, UNIQUEJOIN, and UNIONTYPE.
> h3. TABLESAMPLE not supported
> fname=archive_excludeHadoop20.q
> {code:sql}
> SELECT key FROM harbucket TABLESAMPLE(BUCKET 1 OUT OF 10) SORT BY key
> {code}
> {noformat}
> org.apache.hadoop.hive.ql.optimizer.calcite.CalciteSemanticException: Table
> Sample specified for harbucket. Currently we don't support Table Sample
> clauses in CBO, turn off cbo for queries on tableSamples.{noformat}
> h3. UNIQUE JOIN not supported
> fname=explainuser_2.q
> {code:sql}
> EXPLAIN FROM UNIQUEJOIN PRESERVE src a_n19 (a_n19.key), PRESERVE src1 b_n15
> (b_n15.key), PRESERVE srcpart c_n4 (c_n4.key) SELECT a_n19.key, b_n15.key,
> c_n4.key
> {code}
> {noformat}
> org.apache.hadoop.hive.ql.optimizer.calcite.CalciteSemanticException: UNIQUE
> JOIN is currently not supported in CBO, turn off cbo to use UNIQUE
> JOIN.{noformat}
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