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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-24182] Add collation-related information to explain output</title>
                <link>https://jira.mongodb.org/browse/SERVER-24182</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="287329">SERVER-24182</key>
            <summary>Add collation-related information to explain output</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 17 May 2016 18:39:18 +0000</created>
                <updated>Tue, 19 Jul 2016 17:04:22 +0000</updated>
                            <resolved>Tue, 5 Jul 2016 13:56:47 +0000</resolved>
                                                    <fixVersion>3.3.10</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1313729" author="xgen-internal-githook" created="Tue, 5 Jul 2016 13:56:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tessavitabile&apos;, u&apos;name&apos;: u&apos;Tess Avitabile&apos;, u&apos;email&apos;: u&apos;tess.avitabile@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24182&quot; title=&quot;Add collation-related information to explain output&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24182&quot;&gt;&lt;del&gt;SERVER-24182&lt;/del&gt;&lt;/a&gt; Add collation-related information to explain output&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46ee3c59c991ca93e63a0a2fc030042bb5e6fa1e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46ee3c59c991ca93e63a0a2fc030042bb5e6fa1e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1304787" author="david.storch" created="Thu, 23 Jun 2016 20:48:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;, your second plan sounds good to me. Unless we typed a really bad bug, the collation on the plans filters should always match the collation associated with the parsed query, so I think it&apos;s fine to not report a collation on, say, the FETCH stage.&lt;/p&gt;</comment>
                            <comment id="1304632" author="tess.avitabile" created="Thu, 23 Jun 2016 19:32:36 +0000"  >&lt;p&gt;Actually, I would like to put the query collation in &quot;parsedQuery&quot;, and put the index collation in each stage that scans an index (IXSCAN, DISTINCT_SCAN, COUNT_SCAN).&lt;/p&gt;

&lt;p&gt;Putting the query collation into every FETCH, SORT_KEY_GENERATOR, etc feels redundant. It also is awkward for the FETCH stage to get the query collation because it only has the filter MatchExpression, which doesn&apos;t necessarily have the collation.&lt;/p&gt;</comment>
                            <comment id="1304305" author="tess.avitabile" created="Thu, 23 Jun 2016 15:53:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;, I&apos;m thinking of adding a collation field to the explain output for the IXSCAN, FETCH, SORT_KEY_GENERATOR, PROJECTION, SORT_MERGE, DISTINCT_SCAN, and COUNT_SCAN stages, since these are all the stages that use either a collator or an index. Can you think of anywhere else you would like to see collation information in the explain output? I also thought of putting it in &quot;parsedQuery&quot;, but we don&apos;t include sort or projection information in there.&lt;/p&gt;</comment>
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