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            <title>[SERVER-7884] The length of arrays should be exposed as a querieable and selectable attribute</title>
                <link>https://jira.mongodb.org/browse/SERVER-7884</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Today the length of the arrays in mongodb documents is not exposed for querying or retrieving. There are many situation where one needs to add to array only if its length is less than N or is a specific size. In the absence of this feature not only one needs to fetch the list first and make a decision on the client, it&apos;s impossible to do it atomically. I believe it&apos;s a natural attribute to expose and it&apos;s fairly easy to.&lt;/p&gt;</description>
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        <key id="58746">SERVER-7884</key>
            <summary>The length of arrays should be exposed as a querieable and selectable attribute</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="yfinkelstein">Yuri Finkelstein</reporter>
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                <created>Sat, 8 Dec 2012 22:37:33 +0000</created>
                <updated>Fri, 15 Feb 2013 15:06:35 +0000</updated>
                            <resolved>Sun, 9 Dec 2012 00:14:35 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="210021" author="eliot" created="Sun, 9 Dec 2012 00:14:25 +0000"  >&lt;p&gt;You can query on the size of the array, (using $size)&lt;br/&gt;
There is another case &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-478&quot; title=&quot;Advanced $size quering&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-478&quot;&gt;&lt;del&gt;SERVER-478&lt;/del&gt;&lt;/a&gt; to extend this.&lt;/p&gt;</comment>
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