slim bouguerra created HIVE-18780:
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Summary: Improve schema discovery For Druid Storage Handler
Key: HIVE-18780
URL: https://issues.apache.org/jira/browse/HIVE-18780
Project: Hive
Issue Type: Improvement
Reporter: slim bouguerra
Assignee: slim bouguerra
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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