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Posted to issues@ignite.apache.org by "Taras Ledkov (Jira)" <ji...@apache.org> on 2020/12/28 13:59:00 UTC
[jira] [Created] (IGNITE-13919) Calcite integration. Single group
aggregates
Taras Ledkov created IGNITE-13919:
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Summary: Calcite integration. Single group aggregates
Key: IGNITE-13919
URL: https://issues.apache.org/jira/browse/IGNITE-13919
Project: Ignite
Issue Type: Improvement
Components: sql
Reporter: Taras Ledkov
Investigate the optimization for single group aggregates,
e.g.: {{SELECT <aggregates> FROM <table>}}
Now the hash based aggregates are used for this case.
We can obtain a little performance improvement.
Also the special cases (e.g.: {{SELECT COUNT(<any-columns>) FROM <table>}}) may be optimized to use table/cache size.
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