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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