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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-8638] Allowed to build {&lt;field&gt;:0} index</title>
                <link>https://jira.mongodb.org/browse/SERVER-8638</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;it is allowed to create an &lt;/p&gt;
{a:0}
&lt;p&gt; index. This index has unexpected behavior with sorting&lt;/p&gt;

&lt;p&gt;&amp;gt; db.some.insert(&lt;/p&gt;
{a:1}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; db.some.ensureIndex(&lt;/p&gt;
{a:0}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; db.some.find().sort(&lt;/p&gt;
{a:1}
&lt;p&gt;)&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;51254055e6f520cff750a549&quot;), &quot;a&quot; : 1 }
&lt;p&gt;&amp;gt; db.some.find().sort(&lt;/p&gt;
{a:1}
&lt;p&gt;).explain()&lt;br/&gt;
{&lt;br/&gt;
	&quot;cursor&quot; : &quot;BtreeCursor a_0 reverse&quot;,&lt;br/&gt;
	&quot;isMultiKey&quot; : false,&lt;br/&gt;
	&quot;n&quot; : 1,&lt;br/&gt;
	&quot;nscannedObjects&quot; : 1,&lt;br/&gt;
	&quot;nscanned&quot; : 1,&lt;br/&gt;
	&quot;nscannedObjectsAllPlans&quot; : 1,&lt;br/&gt;
	&quot;nscannedAllPlans&quot; : 1,&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;br/&gt;
		&quot;a&quot; : [&lt;br/&gt;
			[&lt;br/&gt;
				&lt;/p&gt;
{
					&quot;$maxElement&quot; : 1
				}
&lt;p&gt;,&lt;/p&gt;
				{
					&quot;$minElement&quot; : 1
				}
&lt;p&gt;			]&lt;br/&gt;
		]&lt;br/&gt;
	},&lt;br/&gt;
	&quot;server&quot; : &quot;logab-osx.local:27017&quot;&lt;br/&gt;
}&lt;br/&gt;
&amp;gt; db.some.find().sort(&lt;/p&gt;
{a:-1}
&lt;p&gt;).explain()&lt;br/&gt;
{&lt;br/&gt;
	&quot;cursor&quot; : &quot;BtreeCursor a_0 reverse&quot;,&lt;br/&gt;
	&quot;isMultiKey&quot; : false,&lt;br/&gt;
	&quot;n&quot; : 1,&lt;br/&gt;
	&quot;nscannedObjects&quot; : 1,&lt;br/&gt;
	&quot;nscanned&quot; : 1,&lt;br/&gt;
	&quot;nscannedObjectsAllPlans&quot; : 1,&lt;br/&gt;
	&quot;nscannedAllPlans&quot; : 1,&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;br/&gt;
		&quot;a&quot; : [&lt;br/&gt;
			[&lt;br/&gt;
				&lt;/p&gt;
{
					&quot;$maxElement&quot; : 1
				}
&lt;p&gt;,&lt;/p&gt;
				{
					&quot;$minElement&quot; : 1
				}
&lt;p&gt;			]&lt;br/&gt;
		]&lt;br/&gt;
	},&lt;br/&gt;
	&quot;server&quot; : &quot;logab-osx.local:27017&quot;&lt;br/&gt;
}&lt;br/&gt;
&amp;gt; &lt;/p&gt;</description>
                <environment>osx 10.8, ubuntu 12.10, ubuntu 10.10</environment>
        <key id="65908">SERVER-8638</key>
            <summary>Allowed to build {&lt;field&gt;:0} index</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="gabol">Anton V. Volokhov</reporter>
                        <labels>
                            <label>indexes</label>
                    </labels>
                <created>Wed, 20 Feb 2013 21:37:59 +0000</created>
                <updated>Fri, 8 Mar 2013 15:56:07 +0000</updated>
                            <resolved>Wed, 20 Feb 2013 21:51:22 +0000</resolved>
                                    <version>2.2.2</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="271520" author="scotthernandez" created="Wed, 20 Feb 2013 21:51:22 +0000"  >&lt;p&gt;That creates an ascending index, as you can see. This is how it works now since we don&apos;t validate the order.&lt;/p&gt;

&lt;p&gt;There are other issues which describe this behavior and ask for better validation or for errors to be generated, for example.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="38486">SERVER-5826</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="11534">SERVER-769</issuekey>
        </issuelink>
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&lt;p&gt;)&lt;br/&gt;
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{a:0}
&lt;p&gt;)&lt;br/&gt;
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{a:1}
&lt;p&gt;).explain()&lt;br/&gt;
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