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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-2330] order of keys is matters in hashes, in find, similar object gives different results on different queries.</title>
                <link>https://jira.mongodb.org/browse/SERVER-2330</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I cant expect  programmers to remember the order  in all places in the code especially in large code base.&lt;/p&gt;

&lt;p&gt;db.eventstatus.insert(&lt;br/&gt;
{&lt;br/&gt;
    &quot;_id&quot;: ObjectId(&quot;4d2093d0aaed39b6d9716b1d&quot;),&lt;br/&gt;
    &quot;t12_status&quot;: [&lt;/p&gt;
{
        &quot;status&quot;: &quot;coming&quot;,
        &quot;invite&quot;: ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),
        &quot;value&quot;: 1
    }
&lt;p&gt;]&lt;br/&gt;
});&lt;/p&gt;

&lt;p&gt;db.eventstatus.insert({&lt;br/&gt;
    &quot;_id&quot;: ObjectId(&quot;4d208dac50e82e8f6500000b&quot;),&lt;br/&gt;
    &quot;t12_status&quot;: [&lt;/p&gt;
{
        &quot;invite&quot;: ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),
        &quot;status&quot;: &quot;coming&quot;,
        &quot;value&quot;: 1
    }
&lt;p&gt;]&lt;br/&gt;
});&lt;/p&gt;

&lt;p&gt;db.eventstatus.find({&quot;t12_status&quot;:{&quot;status&quot;:&quot;coming&quot;,&quot;invite&quot;:ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),&quot;value&quot;:1}});&lt;br/&gt;
db.eventstatus.find({&quot;t12_status&quot;:{&quot;invite&quot;:ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),&quot;status&quot;:&quot;coming&quot;,&quot;value&quot;:1}});&lt;/p&gt;

&lt;p&gt;//expected: both queries will return the 2 documents. - wanted&lt;br/&gt;
//actual@v1.6.5: each query returns a different object, one object. - not wanted, unexpected&lt;/p&gt;</description>
                <environment>Ubuntu 10 server 64bit</environment>
        <key id="14156">SERVER-2330</key>
            <summary>order of keys is matters in hashes, in find, similar object gives different results on different queries.</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="shimondoodkin">Shimon Doodkin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Jan 2011 01:11:27 +0000</created>
                <updated>Thu, 17 Mar 2011 19:13:11 +0000</updated>
                            <resolved>Wed, 5 Jan 2011 04:13:27 +0000</resolved>
                                    <version>1.6.5</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="22081" author="eliot" created="Wed, 5 Jan 2011 14:10:44 +0000"  >&lt;p&gt;That is what $elemMatch is for.&lt;br/&gt;
You should try that,&lt;/p&gt;</comment>
                            <comment id="22079" author="shimondoodkin" created="Wed, 5 Jan 2011 11:23:49 +0000"  >&lt;p&gt;then this test fails:&lt;/p&gt;

&lt;p&gt;db.eventstatus.drop();&lt;br/&gt;
db.eventstatus.insert( &lt;br/&gt;
{&lt;br/&gt;
    &quot;_id&quot;: ObjectId(&quot;4d2093d0aaed39b6d9716b1d&quot;), &lt;br/&gt;
    &quot;t12_status&quot;: [&lt;/p&gt;
{ 
        &quot;status&quot;: &quot;coming&quot;, 
        &quot;invite&quot;: ObjectId(&quot;4d208cdb50e82e8f65000002&quot;), 
        &quot;value&quot;: 2
    }
&lt;p&gt;,&lt;/p&gt;
    {
        &quot;status&quot;: &quot;ride&quot;, 
        &quot;invite&quot;: ObjectId(&quot;4d208cdb50e82e8f65000002&quot;), 
        &quot;value&quot;: 1 
    }
&lt;p&gt;    ] &lt;br/&gt;
});&lt;/p&gt;

&lt;p&gt;db.eventstatus.find(&lt;/p&gt;
{&quot;t12_status.status&quot;:&quot;coming&quot;,&quot;t12_status.invite&quot;:ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),&quot;t12_status.value&quot;:1}
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;{ &quot;_id&quot; : ObjectId(&quot;4d2093d0aaed39b6d9716b1d&quot;), &quot;t12_status&quot; : [&lt;br/&gt;
        &lt;/p&gt;
{
                &quot;status&quot; : &quot;coming&quot;,
                &quot;invite&quot; : ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),
                &quot;value&quot; : 2
        }
&lt;p&gt;,&lt;/p&gt;
        {
                &quot;status&quot; : &quot;ride&quot;,
                &quot;invite&quot; : ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),
                &quot;value&quot; : 1
        }
&lt;p&gt;] }&lt;/p&gt;

&lt;p&gt;it returns incorrectly a document with no&lt;/p&gt;

      {
                &quot;status&quot; : &quot;coming&quot;,
                &quot;invite&quot; : ObjectId(&quot;4d208cdb50e82e8f65000002&quot;),
                &quot;value&quot; : 1
        }

&lt;p&gt;in the t12_status array&lt;/p&gt;</comment>
                            <comment id="22066" author="eliot" created="Wed, 5 Jan 2011 04:13:27 +0000"  >&lt;p&gt;BSON is ordered.&lt;br/&gt;
For most use cases this is correct.&lt;/p&gt;

&lt;p&gt;If you don&apos;t care about order, you can query using &lt;/p&gt;
{ &quot;a.b&quot; : 1 , &quot;a.c&quot; : 1 }
&lt;p&gt; style &lt;/p&gt;</comment>
                            <comment id="22065" author="shimondoodkin" created="Wed, 5 Jan 2011 02:11:25 +0000"  >&lt;p&gt;I could not find in my code where the order is switched.&lt;/p&gt;</comment>
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