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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-69103] Disable use of SBE on the inner side of DocumentSourceLookup</title>
                <link>https://jira.mongodb.org/browse/SERVER-69103</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current state of affairs is that the normal engine selection rules are used when deciding whether SBE or the classic engine should be used for queries issued recursively by &lt;tt&gt;DocumentSourceLookup&lt;/tt&gt;.&#160;This has proven to be problematic for performance, especially for some of the TPC-H benchmarks which we run. In particular, the auto-parameterization rules for the SBE plan cache differ from those for the classic engine&apos;s cache &amp;#8211; join predicates expressed using &lt;tt&gt;$expr&lt;/tt&gt; will not benefit from plan caching on the inner side, resulting in a substantial performance regression (especially when the plan cache has not yet been populated).&lt;/p&gt;

&lt;p&gt;The work for this ticket is to ensure that the classic engine is always used on the inner side of a &lt;tt&gt;DocumentSourceLookup&lt;/tt&gt;. (The cases in which $lookup is fully pushed down to the SBE layer will not be affected by this change.) This will likely immediately restore performance for a number of TPC-H queries. It also seems like a useful simplification in that we will not support this relatively complicated &quot;hybrid plans&quot; scenario in SBE until we are confident that basic cases are performing well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2120450">SERVER-69103</key>
            <summary>Disable use of SBE on the inner side of DocumentSourceLookup</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>pm2697-m2</label>
                    </labels>
                <created>Tue, 23 Aug 2022 20:22:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:34:04 +0000</updated>
                            <resolved>Fri, 26 Aug 2022 17:51:12 +0000</resolved>
                                                    <fixVersion>6.0.2</fixVersion>
                    <fixVersion>6.1.0-rc1</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4793570" author="xgen-internal-githook" created="Wed, 31 Aug 2022 21:36:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69103&quot; title=&quot;Disable use of SBE on the inner side of DocumentSourceLookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69103&quot;&gt;&lt;del&gt;SERVER-69103&lt;/del&gt;&lt;/a&gt; Always use the classic engine on the inner side of DocumentSourceLookup or $graphLookup&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 331e44c65a4806d5d619ec4424380b34b071c463)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d06938ab1de563d58fc1974352ead554e28ef1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0d06938ab1de563d58fc1974352ead554e28ef1f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4793321" author="xgen-internal-githook" created="Wed, 31 Aug 2022 20:46:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69103&quot; title=&quot;Disable use of SBE on the inner side of DocumentSourceLookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69103&quot;&gt;&lt;del&gt;SERVER-69103&lt;/del&gt;&lt;/a&gt; Always use the classic engine on the inner side of DocumentSourceLookup or $graphLookup&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 331e44c65a4806d5d619ec4424380b34b071c463)&lt;br/&gt;
Branch: v6.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fd671b6b1e3272fb741b7dde16b2b9f1499b148f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fd671b6b1e3272fb741b7dde16b2b9f1499b148f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4780155" author="xgen-internal-githook" created="Fri, 26 Aug 2022 17:41:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69103&quot; title=&quot;Disable use of SBE on the inner side of DocumentSourceLookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69103&quot;&gt;&lt;del&gt;SERVER-69103&lt;/del&gt;&lt;/a&gt; Always use the classic engine on the inner side of DocumentSourceLookup or $graphLookup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/331e44c65a4806d5d619ec4424380b34b071c463&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/331e44c65a4806d5d619ec4424380b34b071c463&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4779772" author="david.storch" created="Fri, 26 Aug 2022 15:41:37 +0000"  >&lt;p&gt;I filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69188&quot; title=&quot;Disable use of SBE on the inner side of DocumentSourceLookup when the inner side is sharded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69188&quot;&gt;SERVER-69188&lt;/a&gt; as an optional improvement to this work to make similar behavior apply across shards in the case of sharded $lookup.&lt;/p&gt;</comment>
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            <issuekey id="2121263">SERVER-69112</issuekey>
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