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https://issues.apache.org/jira/browse/SPARK-26672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wang, Gang resolved SPARK-26672.
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Resolution: Not A Problem
This is only a bug in our inner Spark version. It's ok in community version.
> SinglePartition may not satisfies
> HashClusteredDistribution/OrderedDistribution
> -------------------------------------------------------------------------------
>
> Key: SPARK-26672
> URL: https://issues.apache.org/jira/browse/SPARK-26672
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Wang, Gang
> Priority: Major
>
> If we are loading data to a *bucketed table* TEST_TABLE of which bucket
> number is not 1, from another table SRC_TABLE(bucketed or not) with sql:
> insert overwrite table TEST_TABLE select * from SRC_TABLE limit 1000.
> Data inserted into TEST_TABLE will not be bucketed since after LimitExec the
> output partitioning will be SinglePartition, and in current logic, it
> satisfies the HashClusteredDistribution, so no shuffle will be added.
>
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