<!-- 
RSS generated by JIRA (9.7.1#970001-sha1:2222b88b221c4928ef0de3161136cc90c8356a66) at Thu Feb 08 02:53:06 UTC 2024

It is possible to restrict the fields that are returned in this document by specifying the 'field' parameter in your request.
For example, to request only the issue key and summary append 'field=key&field=summary' to the URL of your request.
-->
<rss version="0.92" >
<channel>
    <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-128] Index not used in Multikeys with $in operator</title>
                <link>https://jira.mongodb.org/browse/SERVER-128</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I create simple test similar described in docs (&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Multikeys&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Multikeys&lt;/a&gt;) for problem demonstration:&lt;br/&gt;
My comment added in output with &quot;&amp;lt;&amp;lt;&amp;lt;===&quot; construction.&lt;br/&gt;
-------------------&lt;br/&gt;
from pymongo.connection import Connection&lt;br/&gt;
from pprint import pprint&lt;/p&gt;

&lt;p&gt;connection = Connection(&quot;localhost&quot;, 27017)&lt;br/&gt;
db = connection.test&lt;/p&gt;

&lt;p&gt;db.create_collection(&quot;example&quot;)&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;example list is [&lt;span class=&quot;error&quot;&gt;&amp;#91;1,2,3,4,5&amp;#93;&lt;/span&gt;,&lt;span class=&quot;error&quot;&gt;&amp;#91;4,5,6,7,8&amp;#93;&lt;/span&gt;,&lt;span class=&quot;error&quot;&gt;&amp;#91;7,8,9,10,11&amp;#93;&lt;/span&gt;,&lt;span class=&quot;error&quot;&gt;&amp;#91;10,11,12,13,14&amp;#93;&lt;/span&gt;...]&lt;br/&gt;
samples = &lt;span class=&quot;error&quot;&gt;&amp;#91;range(i, i+5) for i in xrange(1, 10000, 3)&amp;#93;&lt;/span&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;for item in samples:&lt;br/&gt;
    db.example.save(&lt;/p&gt;
{&quot;test&quot;:item}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;db.example.ensure_index(&quot;test&quot;,1)&lt;br/&gt;
query = {&quot;test&quot;:{&quot;$in&quot;:&lt;span class=&quot;error&quot;&gt;&amp;#91;1,100,9000&amp;#93;&lt;/span&gt;}}&lt;/p&gt;

&lt;p&gt;print &quot;Result:&quot;&lt;br/&gt;
pprint(list(db.example.find(query)))&lt;/p&gt;

&lt;p&gt;print &quot;\nQuery Explain:&quot;&lt;br/&gt;
explain = db.example.find(query).explain()&lt;br/&gt;
pprint(dict(explain.items()))&lt;br/&gt;
----------------------------&lt;/p&gt;

&lt;p&gt;After run it, I receive explain output:&lt;br/&gt;
...&amp;lt;skipped&amp;gt;...&lt;br/&gt;
{u&apos;allPlans&apos;: [{u&apos;cursor&apos;: u&apos;BtreeCursor test_1&apos;,&lt;br/&gt;
                u&apos;endKey&apos;: &lt;/p&gt;
{u&apos;test&apos;: 9000}
&lt;p&gt;,&lt;br/&gt;
                u&apos;startKey&apos;: {u&apos;test&apos;: 1}}],&lt;br/&gt;
 u&apos;cursor&apos;: u&apos;BtreeCursor test_1&apos;,&lt;br/&gt;
 u&apos;endKey&apos;: &lt;/p&gt;
{u&apos;test&apos;: 9000}
&lt;p&gt;,&lt;br/&gt;
 u&apos;millis&apos;: 25,&lt;br/&gt;
 u&apos;n&apos;: 4,&lt;br/&gt;
 u&apos;nscanned&apos;: 14998.0,  &amp;lt;&amp;lt;&amp;lt;====== Why &apos;nscanned&apos; so large?! With index!&lt;br/&gt;
 u&apos;oldPlan&apos;: {u&apos;cursor&apos;: u&apos;BtreeCursor test_1&apos;,&lt;br/&gt;
              u&apos;endKey&apos;: &lt;/p&gt;
{u&apos;test&apos;: 9000}
&lt;p&gt;,&lt;br/&gt;
              u&apos;startKey&apos;: {u&apos;test&apos;: 1}},&lt;br/&gt;
 u&apos;startKey&apos;: {u&apos;test&apos;: 1}}&lt;br/&gt;
-------------&lt;/p&gt;

&lt;p&gt;When I try to get records without IN&lt;/p&gt;

&lt;p&gt;explain = db.example.find(&lt;/p&gt;
{&quot;test&quot;:9000}
&lt;p&gt;).explain()&lt;br/&gt;
pprint(dict(explain.items()))&lt;/p&gt;

&lt;p&gt;result look as:&lt;/p&gt;

&lt;p&gt;{u&apos;allPlans&apos;: [{u&apos;cursor&apos;: u&apos;BtreeCursor test_1&apos;,&lt;br/&gt;
                u&apos;endKey&apos;: &lt;/p&gt;
{u&apos;test&apos;: 9000}
&lt;p&gt;,&lt;br/&gt;
                u&apos;startKey&apos;: {u&apos;test&apos;: 9000}}],&lt;br/&gt;
 u&apos;cursor&apos;: u&apos;BtreeCursor test_1&apos;,&lt;br/&gt;
 u&apos;endKey&apos;: &lt;/p&gt;
{u&apos;test&apos;: 9000}
&lt;p&gt;,&lt;br/&gt;
 u&apos;millis&apos;: 0, &amp;lt;&amp;lt;&amp;lt;========== very fast&lt;br/&gt;
 u&apos;n&apos;: 1,&lt;br/&gt;
 u&apos;nscanned&apos;: 1.0,&lt;br/&gt;
 u&apos;oldPlan&apos;: {u&apos;cursor&apos;: u&apos;BtreeCursor test_1&apos;,&lt;br/&gt;
              u&apos;endKey&apos;: &lt;/p&gt;
{u&apos;test&apos;: 9000}
&lt;p&gt;,&lt;br/&gt;
              u&apos;startKey&apos;: {u&apos;test&apos;: 9000}},&lt;br/&gt;
 u&apos;startKey&apos;: {u&apos;test&apos;: 9000}}&lt;/p&gt;

&lt;p&gt;It&apos;s a normal behavior?&lt;/p&gt;</description>
                <environment>Ubuntu Server 9.04, 768 RAM, fresh installation of MongoDB 0.9.5, pymongo connector</environment>
        <key id="10253">SERVER-128</key>
            <summary>Index not used in Multikeys with $in operator</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="3">Duplicate</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="kpot">Kirill Mavreshko</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Jul 2009 02:07:55 +0000</created>
                <updated>Thu, 30 Jul 2009 17:23:31 +0000</updated>
                            <resolved>Mon, 6 Jul 2009 07:13:25 +0000</resolved>
                                    <version>0.9.5</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="10345" author="eliot" created="Thu, 30 Jul 2009 17:23:31 +0000"  >&lt;p&gt;closed since resolved and no activity in 2 weeks.&lt;br/&gt;
re-open if still issues.&lt;/p&gt;</comment>
                            <comment id="10221" author="eliot" created="Mon, 6 Jul 2009 07:13:25 +0000"  >&lt;p&gt;It uses the index, but right now is stupid and looks at the entire range.&lt;br/&gt;
We&apos;ve got another case open to fix it  SERVER-100  you could watch that.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                    </attachments>
                <subtasks>
                    </subtasks>
                <customfields>
                                                <customfield id="customfield_10050" key="com.atlassian.jira.toolkit:comments">
                        <customfieldname># Replies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>2.0</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                <customfield id="customfield_10055" key="com.atlassian.jira.ext.charting:firstresponsedate">
                        <customfieldname>Date of 1st Reply</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>Mon, 6 Jul 2009 07:13:25 +0000</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10052" key="com.atlassian.jira.toolkit:dayslastcommented">
                        <customfieldname>Days since reply</customfieldname>
                        <customfieldvalues>
                                        14 years, 29 weeks, 6 days ago
    
                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_18254" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Dependencies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue><![CDATA[]]></customfieldvalue>


                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_15850" key="com.atlassian.jira.plugins.jira-development-integration-plugin:devsummary">
                        <customfieldname>Development</customfieldname>
                        <customfieldvalues>
                            
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    <customfield id="customfield_10057" key="com.atlassian.jira.toolkit:lastusercommented">
                        <customfieldname>Last comment by Customer</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>true</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                            <customfield id="customfield_10056" key="com.atlassian.jira.toolkit:lastupdaterorcommenter">
                        <customfieldname>Last commenter</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>ian@mongodb.com</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_11151" key="com.atlassian.jira.toolkit:LastCommentDate">
                        <customfieldname>Last public comment date</customfieldname>
                        <customfieldvalues>
                            14 years, 29 weeks, 6 days ago
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                <customfield id="customfield_10051" key="com.atlassian.jira.toolkit:participants">
                        <customfieldname>Participants</customfieldname>
                        <customfieldvalues>
                                        <customfieldvalue>eliot</customfieldvalue>
            <customfieldvalue>kpot</customfieldvalue>
    
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                        <customfield id="customfield_14254" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Product Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|hrpxpj:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                <customfield id="customfield_12550" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>2|hriunr:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10558" key="com.pyxis.greenhopper.jira:gh-global-rank">
                        <customfieldname>Rank (Obsolete)</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>23620</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                            <customfield id="customfield_23361" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Requested By</customfieldname>
                        <customfieldvalues>
                                

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            <customfield id="customfield_10053" key="com.atlassian.jira.ext.charting:timeinstatus">
                        <customfieldname>Time In Status</customfieldname>
                        <customfieldvalues>
                            
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_22870" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Triagers</customfieldname>
                        <customfieldvalues>
                                

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                    <customfield id="customfield_14350" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>serverRank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|ht0lnr:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                    </customfields>
    </item>
</channel>
</rss>