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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-15164] positional operator element mismatch when using both $slice and $ projections</title>
                <link>https://jira.mongodb.org/browse/SERVER-15164</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It is not possible to use both $slice and $ projections, even if they are on separate fields.&lt;/p&gt;</description>
                <environment></environment>
        <key id="156756">SERVER-15164</key>
            <summary>positional operator element mismatch when using both $slice and $ projections</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="mitar">NOVALUE Mitar</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Sun, 7 Sep 2014 04:50:34 +0000</created>
                <updated>Fri, 15 Nov 2019 16:59:32 +0000</updated>
                            <resolved>Fri, 15 Nov 2019 16:59:32 +0000</resolved>
                                    <version>2.4.8</version>
                    <version>2.6.4</version>
                    <version>2.7.6</version>
                                    <fixVersion>4.3.2</fixVersion>
                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2543460" author="ian.boros" created="Fri, 15 Nov 2019 16:59:12 +0000"  >&lt;p&gt;It looks like this was fixed &quot;for free&quot; during our work to unify the projection implementations. Added a test and now closing. &lt;/p&gt;</comment>
                            <comment id="2541570" author="xgen-internal-githook" created="Thu, 14 Nov 2019 21:32:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ian Boros&apos;, &apos;username&apos;: &apos;puppyofkosh&apos;, &apos;email&apos;: &apos;ian.boros@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15164&quot; title=&quot;positional operator element mismatch when using both $slice and $ projections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15164&quot;&gt;&lt;del&gt;SERVER-15164&lt;/del&gt;&lt;/a&gt; test that positional operator and $slice can be used in the same projection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cdc44d95e169da75093f25c324aa9670e72743e8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cdc44d95e169da75093f25c324aa9670e72743e8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2360300" author="mitar" created="Tue, 6 Aug 2019 20:02:09 +0000"  >&lt;p&gt;No worries. Glad to hear you are working on/discussing cleaning this a bit. &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="2360276" author="ian.boros" created="Tue, 6 Aug 2019 19:56:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mitar&quot; class=&quot;user-hover&quot; rel=&quot;mitar&quot;&gt;mitar&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I actually mistook this example for a separate quirk in the interaction between $slice and positional projection which I&apos;d been discussing with another query team member recently. I didn&apos;t mean to alarm you.&lt;/p&gt;</comment>
                            <comment id="2359856" author="mitar" created="Tue, 6 Aug 2019 16:49:52 +0000"  >&lt;p&gt;Oh, I just now noticed this.&lt;/p&gt;

&lt;p&gt;Why would you end up banning this? Those things operate on completely unrelated things? Why would slicing in projection on one field prevent work on the other.&lt;/p&gt;

&lt;p&gt;The workaround is problematic because it requires one to duplicate the query in the projection. This is tricky if you are generating queries automatically. For example, imagine that you have a query builder for an user. You have a select query part, and then user selects which fields to select. The last in jobs, and whatever was matched in query. Now you have to detect that there is a slice in jobs and change the importing projection to $elemMatch? Or should you then always use $elemMatch repeating the search condition? But then you have to parse the query and rewrite it into $elemMatch?&lt;/p&gt;

&lt;p&gt;What is the purpose of having $ in the projection then, if it fails on more complicated projections?&lt;/p&gt;</comment>
                            <comment id="2359832" author="ian.boros" created="Tue, 6 Aug 2019 16:35:27 +0000"  >&lt;p&gt;Sounds good. I suspect we&apos;ll end up banning this.&lt;/p&gt;</comment>
                            <comment id="713190" author="asya" created="Sun, 7 Sep 2014 22:50:14 +0000"  >&lt;p&gt;You can use the &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/elemMatch/#elemmatch-projection&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$elemMatch projection operator&lt;/a&gt; to get the result you want:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;db.test.find( { &quot;importing.foo&quot;: &quot;b&quot; },   { jobs: { &apos;$slice&apos;: -1 },  &apos;importing&apos; : { &quot;$elemMatch&quot; : { &quot;foo&quot; : &quot;b&quot; } }  }  )&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 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;{ &quot;_id&quot; : ObjectId(&quot;540cdf10ce5fcf3db923f4d1&quot;), &quot;importing&quot; : [ { &quot;foo&quot; : &quot;b&quot; } ], &quot;jobs&quot; : [ { &quot;status&quot; : &quot;completed&quot; } ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="48158">SERVER-6864</issuekey>
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                            <customfieldvalue>&lt;p&gt;You insert a document with two array fields:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;db.test.insert( { &quot;importing&quot; : [ { &quot;foo&quot;: &quot;a&quot; }, { &quot;foo&quot;: &quot;b&quot; } ], &quot;jobs&quot; : [ { &quot;status&quot; : &quot;completed&quot; } ] } )&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;You try to query it, where you use $slice on one, and $ on another. The query should match the second element in importing, which does not exist in jobs:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;db.test.find( { &quot;importing.foo&quot;: &quot;b&quot; }, { jobs: { &apos;$slice&apos;: -1 }, &apos;importing.$&apos;: 1 })&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;You get:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;error: { &quot;$err&quot; : &quot;positional operator element mismatch&quot;, &quot;code&quot; : 16353 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</customfieldvalue>

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