Nishant Bangarwa created CALCITE-2077:
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Summary: Use druid scan query instead of the select query.
Key: CALCITE-2077
URL: https://issues.apache.org/jira/browse/CALCITE-2077
Project: Calcite
Issue Type: Improvement
Reporter: Nishant Bangarwa
Assignee: Nishant Bangarwa
The biggest difference between select query and scan query is that, scan query
doesn't retain all rows in memory before rows can be returned to client.
Select query on very large segments will cause memory pressure on druid
historicals if too many rows required by select query whereas Scan query
doesn't have this issue.
Scan query can also return all rows without issuing another pagination query,
which is extremely useful when query against historical or realtime node
directly.
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