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https://issues.apache.org/jira/browse/HIVE-25948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17953374#comment-17953374
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Denys Kuzmenko commented on HIVE-25948:
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#5789 added a `hive.optimize.sort.dynamic.partition.threshold` config toggle,
which would be improved with a dynamic decision based on partition cardinality.
> Optimize Iceberg writes by directing records either Clustered- or Fanoutwriter
> ------------------------------------------------------------------------------
>
> Key: HIVE-25948
> URL: https://issues.apache.org/jira/browse/HIVE-25948
> Project: Hive
> Issue Type: Improvement
> Reporter: Ádám Szita
> Assignee: Ádám Szita
> Priority: Major
> Labels: pull-request-available
>
> Currently Hive writes Iceberg tables with ClusteredWriter. This has less
> memory footprint as it only keeps one writer open at a time, but requires the
> records to be sorted.
> However if data cardinality is low Fanoutwriter is a better choice for
> performance.
> We should add support so that either can be used, and the decision could be
> based similarly how currently SortedDynPartitonOptimizer has it.
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