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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-44657] Variables class does not behave as an associative map</title>
                <link>https://jira.mongodb.org/browse/SERVER-44657</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;See the related BF for the context. The problem is in Variables class. It&apos;s interface seems like an associative map from Id (64 bit int) to Value (ValueAndState).&lt;br/&gt;
However, internally it uses std::vector instead of a real map. So when we call setValue(100000, ...) it actually allocates a vector of 100000 elements and then _valueList&lt;span class=&quot;error&quot;&gt;&amp;#91;100000&amp;#93;&lt;/span&gt; = ...&lt;br/&gt;
Even though there is only 1 variable the underlying vector is 100000 elements big!!! The vector then gets constructed/destructed many times in the $graphlookup hence it takes forever to execute.&lt;br/&gt;
The tangential question is why the Id goes up so much in the graphlookup query. The partial answer is that we do not reset the IdGenerator for every subpipeline we construct. It was deemed more risky to reset if back to 0 than switching to a proper map in Variables class.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1004685">SERVER-44657</key>
            <summary>Variables class does not behave as an associative map</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="13201">Fixed</resolution>
                                        <assignee username="anton.korshunov@mongodb.com">Anton Korshunov</assignee>
                                    <reporter username="martin.neupauer@mongodb.com">Martin Neupauer</reporter>
                        <labels>
                            <label>afz</label>
                            <label>qexec-team</label>
                    </labels>
                <created>Fri, 15 Nov 2019 17:03:46 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:53 +0000</updated>
                            <resolved>Fri, 20 Mar 2020 21:44:13 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2990848" author="xgen-internal-githook" created="Fri, 20 Mar 2020 21:28:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Anton Korshunov&apos;, &apos;username&apos;: &apos;antkorsh&apos;, &apos;email&apos;: &apos;anton.korshunov@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44657&quot; title=&quot;Variables class does not behave as an associative map&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44657&quot;&gt;&lt;del&gt;SERVER-44657&lt;/del&gt;&lt;/a&gt; Variables class does not behave as an associative map&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a6740f45374acb4171edc920240c51218754fb0a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a6740f45374acb4171edc920240c51218754fb0a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2658515" author="martin.neupauer" created="Fri, 20 Dec 2019 19:37:26 +0000"  >&lt;p&gt;I&apos;ll replace std::vector&amp;lt;ValueAndState&amp;gt; _valueList; with stdx::unordered_map&amp;lt;Id, ValueAndState&amp;gt; _valueList; in the Variables class and it should do the trick. &lt;/p&gt;</comment>
                            <comment id="2559846" author="david.storch" created="Thu, 21 Nov 2019 16:49:31 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=martin.neupauer&quot; class=&quot;user-hover&quot; rel=&quot;martin.neupauer&quot;&gt;martin.neupauer&lt;/a&gt; can you take a look at this tomorrow for BF friday?&lt;/p&gt;</comment>
                            <comment id="2549350" author="craig.homa" created="Tue, 19 Nov 2019 16:41:51 +0000"  >&lt;p&gt;We plan to look for a fix on a future BF Friday.&lt;/p&gt;</comment>
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