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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-23093] String comparison predicates using an index with a collation should generate EXACT bounds (but cannot be covered)</title>
                <link>https://jira.mongodb.org/browse/SERVER-23093</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the IndexBoundsBuilder enforces the property that we never generate a covered plan which will return collator-generated index keys to the user. It does this by returning a tightness of INEXACT_FETCH for any predicate which translates to string bounds over an index with a non-null collator. The consequence is that the access planner will affix such predicates as a filter to the FETCH stage. However, passing the documents through this additional filter is not necessary, since the bounds are logically EXACT.&lt;/p&gt;

&lt;p&gt;For instance, suppose that we have an index {a: 1} with a mock collation whose comparison keys are the reverse of the indexed strings. If we insert {a: &apos;foo&apos;} into the collection, this will generate index key {&apos;&apos;: &apos;oof&apos;}. The current planner implementation will generate a plan that scans the bounds [&apos;oof&apos;, &apos;oof&apos;], fetches the corresponding document, and then filters again by the predicate {a: &apos;foo&apos;}. Although the FETCH is necessary to recover the original string, the filter is not needed. The bounds [&apos;oof&apos;, &apos;oof&apos;] recover exactly the set of documents that match according to the collation!&lt;/p&gt;</description>
                <environment></environment>
        <key id="271888">SERVER-23093</key>
            <summary>String comparison predicates using an index with a collation should generate EXACT bounds (but cannot be covered)</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Mar 2016 18:56:17 +0000</created>
                <updated>Fri, 2 Sep 2016 00:28:55 +0000</updated>
                            <resolved>Mon, 15 Aug 2016 19:29:55 +0000</resolved>
                                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1357283" author="xgen-internal-githook" created="Mon, 15 Aug 2016 19:28:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23093&quot; title=&quot;String comparison predicates using an index with a collation should generate EXACT bounds (but cannot be covered)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23093&quot;&gt;&lt;del&gt;SERVER-23093&lt;/del&gt;&lt;/a&gt; avoid extra predicate evaluation for indexed collation-aware queries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e7b0ba5c67df867bfb31bd6028b41631f04164a6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e7b0ba5c67df867bfb31bd6028b41631f04164a6&lt;/a&gt;&lt;/p&gt;</comment>
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