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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-58431] Modify HashAgg stage in preparation for $lookup + $group pushdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-58431</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Two important changes must be made to HashAgg:&lt;br/&gt;
1) It should have a flag for whether or not to recompute the hash table on calls to re-open. In the case where the HashAgg is on the right side of an NLJ and there are no correlated variables below it (or used in the HashAgg itself), we can safely skip any re-computation. This will be an important optimization to have for the way $lookup will be translated.&lt;br/&gt;
2) It should have an option to &quot;look up&quot; a particular group key chosen at runtime. That is, on re-opens, when the hash table is already built (and does not need to be re-built) the stage should simply position itself at this key and then return EOF.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1815209">SERVER-58431</key>
            <summary>Modify HashAgg stage in preparation for $lookup + $group pushdown</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="martin.neupauer@mongodb.com">Martin Neupauer</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Jul 2021 14:59:12 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:04 +0000</updated>
                            <resolved>Mon, 26 Jul 2021 19:18:10 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4106980" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:14:20 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3963610" author="xgen-internal-githook" created="Mon, 26 Jul 2021 18:36:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Martin Neupauer&apos;, &apos;email&apos;: &apos;martin.neupauer@mongodb.com&apos;, &apos;username&apos;: &apos;MartinNeupauer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58431&quot; title=&quot;Modify HashAgg stage in preparation for $lookup + $group pushdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58431&quot;&gt;&lt;del&gt;SERVER-58431&lt;/del&gt;&lt;/a&gt; Modify HashAgg stage in preparation for $lookup + $group pushdown&lt;/p&gt;

&lt;p&gt;Fix the reopen case when we do not provide seek keys.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4224de7c24a33d5ac58d3ce6072e3a8f42f691bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4224de7c24a33d5ac58d3ce6072e3a8f42f691bc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3963502" author="martin.neupauer" created="Mon, 26 Jul 2021 18:01:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/pull/135&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/pull/135&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3958072" author="xgen-internal-githook" created="Thu, 22 Jul 2021 17:22:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Martin Neupauer&apos;, &apos;email&apos;: &apos;martin.neupauer@mongodb.com&apos;, &apos;username&apos;: &apos;MartinNeupauer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58431&quot; title=&quot;Modify HashAgg stage in preparation for $lookup + $group pushdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58431&quot;&gt;&lt;del&gt;SERVER-58431&lt;/del&gt;&lt;/a&gt; Modify HashAgg stage in preparation for $lookup + $group pushdown&lt;/p&gt;

&lt;p&gt;Implemented optinal seek keys used to lookup a particular key in the hash table.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f5afeb9966a9a58f26347c3670bd42f36560eb8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f5afeb9966a9a58f26347c3670bd42f36560eb8a&lt;/a&gt;&lt;/p&gt;</comment>
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