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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35561] $geoNear &quot;distanceField&quot; and &quot;includeLocs&quot; options unnecessarily overwrite existing paths</title>
                <link>https://jira.mongodb.org/browse/SERVER-35561</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider a collection with documents of the shape&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;This aggregation using the $geoNear stage computes new fields in &quot;nested&quot;:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        near: {type: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;Point&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, coordinates: [0, 0]},&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;However, the aggregation system overwrites the field &quot;nested.field&quot;, even though it &lt;em&gt;could&lt;/em&gt; be preserved. This behavior occurs if the existing document field shares a prefix with either the &quot;distanceField&quot; or &quot;includeLocs&quot; options.&lt;/p&gt;

&lt;p&gt;This ticket is a request to preserve as much existing information as possible.&lt;/p&gt;</description>
                <environment></environment>
        <key id="558110">SERVER-35561</key>
            <summary>$geoNear &quot;distanceField&quot; and &quot;includeLocs&quot; options unnecessarily overwrite existing paths</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>open_todo_in_code</label>
                            <label>storch</label>
                    </labels>
                <created>Tue, 12 Jun 2018 17:36:02 +0000</created>
                <updated>Tue, 6 Dec 2022 03:26:29 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3797550" author="kyle.suarez" created="Thu, 20 May 2021 20:34:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.percy&quot; class=&quot;user-hover&quot; rel=&quot;david.percy&quot;&gt;david.percy&lt;/a&gt;, that&apos;s a good point to consider.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kateryna.kamenieva&quot; class=&quot;user-hover&quot; rel=&quot;kateryna.kamenieva&quot;&gt;kateryna.kamenieva&lt;/a&gt;, do you have a sense if any actual users of $geoNear would actually want this feature? Maybe all we really need to do here is ensure the docs mention that you will overwrite the output destination, so that users who don&apos;t want that behavior make sure to use a different field.&lt;/p&gt;</comment>
                            <comment id="3793337" author="david.percy" created="Wed, 19 May 2021 22:18:40 +0000"  >&lt;p&gt;Would this make covered queries harder?  We might need to read &quot;nested&quot; before we can write &quot;nested.dist&quot;.  &lt;/p&gt;

&lt;p&gt;Maybe this only matters in some weird cases involving arrays?  If &quot;nested&quot; is an array of objects, and we&apos;re being consistent with $addFields, then writing &quot;nested.dist&quot; means writing &quot;dist&quot; to each object in the array.&lt;/p&gt;</comment>
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