[jira] [Created] (IGNITE-13919) Calcite integration. Single group aggregates

[Anton Vinogradov (Jira)]

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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