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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-5807] Query doesn&apos;t process correctly advanced queries on Multikeys index</title>
                <link>https://jira.mongodb.org/browse/SERVER-5807</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;em&gt;lookups&lt;/em&gt; index has been set as explained in &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Using+Multikeys+to+Simulate+a+Large+Number+of+Indexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Using+Multikeys+to+Simulate+a+Large+Number+of+Indexes&lt;/a&gt; &lt;/p&gt;

&lt;p&gt;The following query doesn&apos;t return any value&lt;br/&gt;
Query condition: { &quot;_lookups&quot; : { &quot;state&quot; : &lt;/p&gt;
{ &quot;$in&quot; : [&quot;Active&quot;, &quot;Verified&quot;] }
&lt;p&gt; } }&lt;br/&gt;
Explain: &lt;br/&gt;
{ &quot;cursor&quot; : &quot;BtreeCursor &lt;em&gt;lookups&lt;/em&gt;&quot;, &quot;nscanned&quot; : 0, &quot;nscannedObjects&quot; : 0, &quot;n&quot; : 0, &quot;millis&quot; : 0, &quot;nYields&quot; : 0, &quot;nChunkSkips&quot; : 0, &quot;isMultiKey&quot; : true, &quot;indexOnly&quot; : false, &quot;indexBounds&quot; : { &quot;_lookups&quot; : [[{ &quot;state&quot; : &lt;/p&gt;
{ &quot;$in&quot; : [&quot;Active&quot;, &quot;Verified&quot;] }
&lt;p&gt; }, { &quot;state&quot; : &lt;/p&gt;
{ &quot;$in&quot; : [&quot;Active&quot;, &quot;Verified&quot;] }
&lt;p&gt; }]] } }&lt;/p&gt;

&lt;p&gt;While&lt;br/&gt;
Query condition: { &quot;$or&quot; : [{ &quot;_lookups&quot; : &lt;/p&gt;
{ &quot;state&quot; : &quot;Active&quot; }
&lt;p&gt; }, { &quot;_lookups&quot; : &lt;/p&gt;
{ &quot;state&quot; : &quot;Verified&quot; }
&lt;p&gt; }] }&lt;br/&gt;
Explain: { &quot;cursor&quot; : &quot;BtreeCursor &lt;em&gt;lookups&lt;/em&gt;&quot;, &quot;nscanned&quot; : 10, &quot;nscannedObjects&quot; : 10, &quot;n&quot; : 10, &quot;millis&quot; : 0, &quot;nYields&quot; : 0, &quot;nChunkSkips&quot; : 0, &quot;isMultiKey&quot; : true, &quot;indexOnly&quot; : false, &quot;indexBounds&quot; : { &quot;_lookups&quot; : [[&lt;/p&gt;
{ &quot;state&quot; : &quot;Active&quot; }
&lt;p&gt;, &lt;/p&gt;
{ &quot;state&quot; : &quot;Active&quot; }
&lt;p&gt;]] } }&lt;/p&gt;

&lt;p&gt;works&lt;/p&gt;</description>
                <environment></environment>
        <key id="38334">SERVER-5807</key>
            <summary>Query doesn&apos;t process correctly advanced queries on Multikeys index</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="-1">Unassigned</assignee>
                                    <reporter username="priam">Laurent</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 May 2012 10:17:13 +0000</created>
                <updated>Sat, 9 Jul 2016 21:09:18 +0000</updated>
                            <resolved>Thu, 10 May 2012 13:40:24 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="118135" author="priam" created="Thu, 10 May 2012 14:39:09 +0000"  >&lt;p&gt;Thanks, you right it was in the doc but not very clearly define. It works now.&lt;/p&gt;</comment>
                            <comment id="118092" author="scotthernandez" created="Thu, 10 May 2012 13:40:24 +0000"  >&lt;p&gt;Your first query is incorrect. It states that you are looking for an element equal to the document &quot;{state:{ $in: ...}}&quot; as described here: &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Indexes#Indexes-UsingDocumentsasKeys&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Indexes#Indexes-UsingDocumentsasKeys&lt;/a&gt;&lt;/p&gt;


&lt;p&gt;If you want the first query to work you would need to use the correct for with $in, which moves the $in query operator after the field (_lookups):&lt;/p&gt;

&lt;p&gt;{ &quot;_lookups&quot; : {$in : [&lt;/p&gt;
{ &quot;state&quot; : &quot;Active&quot;}
&lt;p&gt;, &lt;/p&gt;
{ &quot;state&quot; : &quot;Verified&quot;}
&lt;p&gt;] }}&lt;/p&gt;

&lt;p&gt;We&apos;ll cleanup the docs to make this a little more clear.&lt;/p&gt;</comment>
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