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https://issues.apache.org/jira/browse/HIVE-18780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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slim bouguerra updated HIVE-18780:
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Attachment: HIVE-18780.8.patch
> Improve schema discovery For Druid Storage Handler
> --------------------------------------------------
>
> Key: HIVE-18780
> URL: https://issues.apache.org/jira/browse/HIVE-18780
> Project: Hive
> Issue Type: Improvement
> Components: Druid integration
> Reporter: slim bouguerra
> Assignee: slim bouguerra
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HIVE-18780.2.patch, HIVE-18780.4.patch,
> HIVE-18780.5.patch, HIVE-18780.6.patch, HIVE-18780.7.patch,
> HIVE-18780.8.patch, HIVE-18780.patch, HIVE-18780.patch
>
>
> Currently, Druid Storage adapter issues a Segment metadata Query every time
> the query is of type Select or Scan. Not only that but then every input split
> (map) will do the same as well since it is using the same Serde, this is very
> expensive and put a lot of pressure on the Druid Cluster. The way to fix this
> is to add the schema out of the calcite plan instead of serializing the query
> itself as part of the Hive query context.
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