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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16512] totalDocsExamined is counted twice in geo near</title>
                <link>https://jira.mongodb.org/browse/SERVER-16512</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In NearStage, we generate serval sub-stages to fetch and sort the data progressively. Every sub-stage is a fetch stage which has a index scan stage as a child. On top of NearStage, we use another top level fetch stage to filter the data if necessary, so it turns out that the &quot;totalDocsExamined&quot; is counted twice for the returned documents, one in the sub fetch stage and one in the top level fetch stage.&lt;/p&gt;

&lt;p&gt;Ideally, &quot;totalDocsExamined&quot; should indicate the number of documents we fetched from disk and &quot;alreadyHasObj&quot; indicates the number of documents already in memory. Currently, &quot;totalDocsExamined&quot; includes &quot;alreadyHasObj&quot;, which makes the &quot;totalDocsExamined&quot; greater than expected for geo near.&lt;/p&gt;

&lt;p&gt;Another approach is to expose the total number of objects already in memory at the top level to make it explicit that totalDocsExamined is not a metric of disk fetch. Or instead, expose the number of documents fetched from disk directly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="174095">SERVER-16512</key>
            <summary>totalDocsExamined is counted twice in geo near</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Dec 2014 20:18:55 +0000</created>
                <updated>Fri, 2 Feb 2018 15:54:37 +0000</updated>
                            <resolved>Thu, 15 Jan 2015 20:03:25 +0000</resolved>
                                    <version>2.8.0-rc2</version>
                                                    <component>Geo</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="805715" author="david.storch" created="Thu, 15 Jan 2015 20:02:56 +0000"  >&lt;p&gt;Closing this as Works as Designed. The double-counting happens because the geoNear plan passes each document through two fetch stages, with two different filters. Each document is indeed examined twice.&lt;/p&gt;

&lt;p&gt;For a more detailed explanation, please refer to the comment added in commit &lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5800d50ed4152a31630f25b5dffea106a93de07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;e5800d50ed&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="805712" author="xgen-internal-githook" created="Thu, 15 Jan 2015 20:00:39 +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-16512&quot; title=&quot;totalDocsExamined is counted twice in geo near&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16512&quot;&gt;&lt;del&gt;SERVER-16512&lt;/del&gt;&lt;/a&gt; add comment explaining &apos;docsExamined&apos; tracking in the FetchStage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5800d50ed4152a31630f25b5dffea106a93de07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5800d50ed4152a31630f25b5dffea106a93de07&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="491490">DOCS-11277</issuekey>
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