slim bouguerra updated HIVE-18780:
    Component/s: Druid integration

> 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
> 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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