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https://issues.apache.org/jira/browse/CALCITE-3952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17090222#comment-17090222
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Vineet Garg commented on CALCITE-3952:
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BTW do you know how can I add test to {{RelOptRulesTest}}? Now that calcite is
using gradle i am unable to figure out how to generate baseline xml file.
> 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
> Priority: Major
>
> 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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