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    <title>MongoDB Jira</title>
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    <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-63449] Improve the decision logic for choosing HJ when lowering $lookup into SBE</title>
                <link>https://jira.mongodb.org/browse/SERVER-63449</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1. Add a query knob for kMaxHashJoinCollectionSize. Currently, we&apos;ve hardcoded the value of 100*1024*1024 in the code that selects the physical join algorithm. This should be a configurable knob (both for testing purposes and to let customers to, effectively, fully suppress HJ)&lt;br/&gt;
2. Add a query knob that limits the number of records in the foreign collection to be considered for a HJ.&lt;br/&gt;
3. Check the storage size of the collection.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1979718">SERVER-63449</key>
            <summary>Improve the decision logic for choosing HJ when lowering $lookup into SBE</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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Feb 2022 19:44:35 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:50 +0000</updated>
                            <resolved>Tue, 8 Mar 2022 03:56:38 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4396943" author="xgen-internal-githook" created="Tue, 8 Mar 2022 02:51:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63449&quot; title=&quot;Improve the decision logic for choosing HJ when lowering $lookup into SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63449&quot;&gt;&lt;del&gt;SERVER-63449&lt;/del&gt;&lt;/a&gt; Add HashJoin query knobs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/210df2e4169b4ff9ae074da943771b31228c0c48&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/210df2e4169b4ff9ae074da943771b31228c0c48&lt;/a&gt;&lt;/p&gt;</comment>
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