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Posted to issues@calcite.apache.org by "Vineet Garg (Jira)" <ji...@apache.org> on 2020/04/23 03:59:00 UTC

[jira] [Created] (CALCITE-3952) Improve SortRemoveRule to remove Sort based on rowcount

Vineet Garg created CALCITE-3952:
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             Summary: Improve SortRemoveRule to remove Sort based on rowcount
                 Key: CALCITE-3952
                 URL: https://issues.apache.org/jira/browse/CALCITE-3952
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Vineet Garg
            Assignee: Vineet Garg


If a query is guaranteed to produce maximum one row it is safe to remove Sort (along with limit). 

Example:
{code:sql}
select count(*) cs from store_sales where ss_ext_sales_price > 100.00 order by cs limit 100
{code}

Although logically equivalent this can greatly benefit physical plans by removing extra operator and avoiding unnecessary data transfer.



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