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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6204] make $pullAll more efficient</title>
                <link>https://jira.mongodb.org/browse/SERVER-6204</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that the $pullAll operator is implemented inefficiently. The current implementation loops over the target array and for each element, loops over the set of things to pull.  So if you are pulling m elements from an array of size n, this takes O(n*m) time.  It is possible to do this in O(n+m) by using a hash table to loop once over things to pull, then once over the target array.  The difference might be noticeable for large values of m and n. &lt;/p&gt;</description>
                <environment></environment>
        <key id="42336">SERVER-6204</key>
            <summary>make $pullAll more efficient</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="matulef">Kevin Matulef</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jun 2012 17:00:34 +0000</created>
                <updated>Mon, 11 Jul 2016 18:32:40 +0000</updated>
                            <resolved>Fri, 29 Jun 2012 16:02:12 +0000</resolved>
                                    <version>2.1.1</version>
                                    <fixVersion>2.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="137985" author="matulef" created="Fri, 29 Jun 2012 16:01:06 +0000"  >&lt;p&gt;Technically the performance is now O(m + n*log m), but the difference is marginal for most practical purposes.  Achieving O(n+m) is a bigger change, since we&apos;d need to use the TR1 unordered_set type and provide a hash function that correctly squashes numbers. &lt;/p&gt;</comment>
                            <comment id="137957" author="auto" created="Fri, 29 Jun 2012 15:08:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-06-29T08:06:46-07:00&apos;, u&apos;email&apos;: u&apos;matulef@10gen.com&apos;, u&apos;name&apos;: u&apos;Kevin Matulef&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6204&quot; title=&quot;make $pullAll more efficient&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6204&quot;&gt;&lt;del&gt;SERVER-6204&lt;/del&gt;&lt;/a&gt; fix inefficiency in pullAll&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eb7e375dd3c6331f0cc30a42fb6cb86d557b68ac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eb7e375dd3c6331f0cc30a42fb6cb86d557b68ac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="137640" author="matulef" created="Thu, 28 Jun 2012 17:34:25 +0000"  >&lt;p&gt;I&apos;m classifying this as a performance &quot;bug&quot;, even though functionality is OK.  &lt;/p&gt;</comment>
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