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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>
    </build-info>


<item>
            <title>[SERVER-10005] $exists:false prevents use of a sparse index on a different field</title>
                <link>https://jira.mongodb.org/browse/SERVER-10005</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you query on two fields, and the first field is sparsly indexed, querying for $exists:true on the second field will use the first field&apos;s index. However, querying for $exists:false on the second field will prevent the use of the FIRST field&apos;s index!&lt;/p&gt;

&lt;p&gt;The problem does not occur if the first field is fully (not sparsely) indexed.&lt;/p&gt;</description>
                <environment>Linux devpocmdb01 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux</environment>
        <key id="80117">SERVER-10005</key>
            <summary>$exists:false prevents use of a sparse index on a different field</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="dwagner">David Wagner</reporter>
                        <labels>
                            <label>indexing</label>
                            <label>query_triage</label>
                    </labels>
                <created>Mon, 24 Jun 2013 18:01:44 +0000</created>
                <updated>Mon, 11 Jul 2016 17:37:59 +0000</updated>
                            <resolved>Fri, 6 Dec 2013 16:17:08 +0000</resolved>
                                    <version>2.4.0</version>
                    <version>2.5.4</version>
                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="466922" author="xgen-internal-githook" created="Fri, 6 Dec 2013 16:16:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10005&quot; title=&quot;$exists:false prevents use of a sparse index on a different field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10005&quot;&gt;&lt;del&gt;SERVER-10005&lt;/del&gt;&lt;/a&gt; added test cases for exists operator with sparse index on different field&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0f0bd1d058375234a639928f90dab26293a584eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0f0bd1d058375234a639928f90dab26293a584eb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="370085" author="dwagner" created="Fri, 28 Jun 2013 16:14:42 +0000"  >&lt;p&gt;Please explain how to use a hint in an update command from the C# driver.&lt;/p&gt;</comment>
                            <comment id="369582" author="dan@10gen.com" created="Fri, 28 Jun 2013 00:38:43 +0000"  >&lt;p&gt;This is a side effect of work done in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3918&quot; title=&quot;make sparse indexes error out on {$exists: false} queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3918&quot;&gt;&lt;del&gt;SERVER-3918&lt;/del&gt;&lt;/a&gt;.  See the &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3918?focusedCommentId=137682&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-137682&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;last comment on that ticket&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The workaround right now is to use a $hint.&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;</comment>
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            <issuekey id="96211">SERVER-11446</issuekey>
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            <issuekey id="87109">SERVER-10608</issuekey>
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                            <customfieldvalue>&lt;p&gt;POC0:PRIMARY&amp;gt; db.foo.find()&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;51c886922b4c67a8571a6720&quot;), &quot;a&quot; : 1 }
{ &quot;_id&quot; : ObjectId(&quot;51c8869a2b4c67a8571a6721&quot;), &quot;a&quot; : 1, &quot;b&quot; : true }
&lt;p&gt;POC0:PRIMARY&amp;gt; db.foo.ensureIndex(&lt;/p&gt;
{a:1}
&lt;p&gt;, &lt;/p&gt;
{sparse:true}
&lt;p&gt;)&lt;br/&gt;
POC0:PRIMARY&amp;gt; db.foo.find({a:1, b:{$exists:true}}).explain()&lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor a_1&quot;,&lt;br/&gt;
        &quot;isMultiKey&quot; : false,&lt;br/&gt;
        &quot;n&quot; : 1,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 2,&lt;br/&gt;
        &quot;nscanned&quot; : 2,&lt;br/&gt;
        &quot;nscannedObjectsAllPlans&quot; : 2,&lt;br/&gt;
        &quot;nscannedAllPlans&quot; : 2,&lt;br/&gt;
        &quot;scanAndOrder&quot; : false,&lt;br/&gt;
        &quot;indexOnly&quot; : false,&lt;br/&gt;
        &quot;nYields&quot; : 0,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;millis&quot; : 0,&lt;br/&gt;
        &quot;indexBounds&quot; : &lt;/p&gt;
{
                &quot;a&quot; : [
                        [
                                1,
                                1
                        ]
                ]
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;server&quot; : &quot;devpocmdb01:27017&quot;&lt;br/&gt;
}&lt;br/&gt;
POC0:PRIMARY&amp;gt; db.foo.find({a:1, b:{$exists:false}}).explain()&lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BasicCursor&quot;,&lt;br/&gt;
        &quot;isMultiKey&quot; : false,&lt;br/&gt;
        &quot;n&quot; : 1,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 2,&lt;br/&gt;
        &quot;nscanned&quot; : 2,&lt;br/&gt;
        &quot;nscannedObjectsAllPlans&quot; : 2,&lt;br/&gt;
        &quot;nscannedAllPlans&quot; : 2,&lt;br/&gt;
        &quot;scanAndOrder&quot; : false,&lt;br/&gt;
        &quot;indexOnly&quot; : false,&lt;br/&gt;
        &quot;nYields&quot; : 0,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;millis&quot; : 0,&lt;br/&gt;
        &quot;indexBounds&quot; : {&lt;/p&gt;

&lt;p&gt;        },&lt;br/&gt;
        &quot;server&quot; : &quot;devpocmdb01:27017&quot;&lt;br/&gt;
}&lt;/p&gt;</customfieldvalue>

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