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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-2259] Limiting data by $slice returns adjacent items in a dict.</title>
                <link>https://jira.mongodb.org/browse/SERVER-2259</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When asking for just an array inside a dict, only that array is returned (good so far). However, when you ask for a slice of that array, other items in that dict are also returned.&lt;/p&gt;

&lt;p&gt;&amp;gt; db.a.save({_id:1, vals: {first:&lt;span class=&quot;error&quot;&gt;&amp;#91;1,2,3,&amp;#93;&lt;/span&gt;, second:&lt;span class=&quot;error&quot;&gt;&amp;#91;1,2,3&amp;#93;&lt;/span&gt;}})&lt;br/&gt;
&amp;gt; db.a.find()&lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;vals&quot; : &lt;/p&gt;
{ &quot;first&quot; : [ 1, 2, 3 ], &quot;second&quot; : [ 1, 2, 3 ] }
&lt;p&gt; }&lt;br/&gt;
&amp;gt; db.a.find({},{&quot;vals.first&quot;:{$slice:2}})&lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;vals&quot; : &lt;/p&gt;
{ &quot;first&quot; : [ 1, 2 ], &quot;second&quot; : [ 1, 2, 3 ] }
&lt;p&gt; }&lt;/p&gt;


&lt;p&gt;//I would have expected this to work... might call that a bug.&lt;/p&gt;

&lt;p&gt;&amp;gt; db.a.find({},{&quot;vals.first&quot;:1, &quot;vals.first&quot;:{$slice:2}})&lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;vals&quot; : &lt;/p&gt;
{ &quot;first&quot; : [ 1, 2 ], &quot;second&quot; : [ 1, 2, 3 ] }
&lt;p&gt; }&lt;/p&gt;


&lt;p&gt;&amp;gt; db.a.find({},{&quot;vals&quot;:0, &quot;vals.first&quot;:{$slice:2}})      &lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;vals&quot; : &lt;/p&gt;
{ &quot;first&quot; : [ 1, 2 ] }
&lt;p&gt; }&lt;/p&gt;


&lt;p&gt;(thanks skot on the #mongodb IRC channel for the example)&lt;/p&gt;</description>
                <environment></environment>
        <key id="14026">SERVER-2259</key>
            <summary>Limiting data by $slice returns adjacent items in a dict.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="heewa">Heewa Barfchin</reporter>
                        <labels>
                            <label>query_triage</label>
                    </labels>
                <created>Mon, 20 Dec 2010 23:45:25 +0000</created>
                <updated>Wed, 10 Dec 2014 23:06:41 +0000</updated>
                            <resolved>Mon, 11 Nov 2013 22:31:57 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>3</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="454716" author="david.storch" created="Mon, 11 Nov 2013 22:33:58 +0000"  >&lt;p&gt;I believe this is a duplicate of &quot;$slice projection returns all fields&quot;, which was resolved as Works as Designed. The behavior in 2.5.3 appears to be the same as it was when this issue was initially reported.&lt;/p&gt;</comment>
                            <comment id="29837" author="oodavid" created="Wed, 27 Apr 2011 14:30:10 +0000"  >&lt;p&gt;Similar issue:&lt;/p&gt;

&lt;p&gt;I want to specify multiple $slice actions on an indexed nested array, eg:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.a.save({ _id:1, vals: &lt;/p&gt;
{ first:[1,2,3,], second:[1,2,3], third:[1,2,3,4,5,6] }
&lt;p&gt; });&lt;br/&gt;
&amp;gt; db.a.find({}, { vals: 0, &apos;vals.first&apos;: {$slice: 2} });&lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;vals&quot; : &lt;/p&gt;
{ &quot;first&quot; : [ 1, 2 ] }
&lt;p&gt; } &lt;/p&gt;

&lt;p&gt;Works as expected, however:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.a.find({}, { vals: 0, &apos;vals.first&apos;: {$slice: 2}, &apos;vals.second&apos;: 1 }) &lt;br/&gt;
uncaught exception: error {&lt;br/&gt;
	&quot;$err&quot; : &quot;You cannot currently mix including and excluding fields. Contact us if this is an issue.&quot;,&lt;br/&gt;
	&quot;code&quot; : 10053&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;Or&lt;/p&gt;

&lt;p&gt;&amp;gt; db.a.find({}, { vals: 0, &apos;vals.first&apos;: {$slice: 2}, &apos;vals.second&apos;: {$slice: 2} }) &lt;br/&gt;
uncaught exception: error {&lt;br/&gt;
	&quot;$err&quot; : &quot;You cannot currently mix including and excluding fields. Contact us if this is an issue.&quot;,&lt;br/&gt;
	&quot;code&quot; : 10053&lt;br/&gt;
}&lt;/p&gt;</comment>
                            <comment id="21622" author="heewa" created="Mon, 20 Dec 2010 23:52:55 +0000"  >&lt;p&gt;Also, it&apos;s not exactly a workaround to explicitly turn off the rest of that containing dict, because everything else in the record is still returned. So, if you had:&lt;/p&gt;

&lt;p&gt;{&apos;a&apos;: ...., &apos;b&apos;: &lt;/p&gt;
{&apos;c&apos;: [1, 2, 3], &apos;d&apos;: [4, 5, 6]}
&lt;p&gt;, &apos;e&apos;: ....}&lt;/p&gt;

&lt;p&gt;And you asked for {&apos;b&apos;: 0, &apos;b.c&apos;: {$slice: 2}}, you&apos;d still get:&lt;/p&gt;

&lt;p&gt;{&apos;a&apos;: ...., &apos;b&apos;: &lt;/p&gt;
{&apos;c&apos;: [1, 2]}
&lt;p&gt;, &apos;e&apos;: ....}&lt;/p&gt;</comment>
                            <comment id="21621" author="scotthernandez" created="Mon, 20 Dec 2010 23:49:47 +0000"  >&lt;p&gt;Just to be clear, this was expected to work... by not returning second&lt;/p&gt;

&lt;p&gt;&amp;gt; db.a.find({},{&quot;vals.first&quot;:{$slice:2}}) &lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;vals&quot; : &lt;/p&gt;
{ &quot;first&quot; : [ 1, 2 ], &quot;second&quot; : [ 1, 2, 3 ] }
&lt;p&gt; } &lt;/p&gt;</comment>
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                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="19172">SERVER-3378</issuekey>
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