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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>[DOCS-15336] Investigate changes in SERVER-65960:  Fall back to classic engine when NLJ is chosen and disable SBE on the right of classic $lookup</title>
                <link>https://jira.mongodb.org/browse/DOCS-15336</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    If we land this patch, NLJ will no longer be pushed down to SBE.&lt;br/&gt;
This is when no index can be used on the foreign side and the foreign side is too big to use a hash join.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    This task should check the index catalog for a wildcard, sparse, partial (possibly other special) indexes against the foreign collection that cover the join field, and if such an index exists we need to fall-back to the classic engine.&#160;&lt;/p&gt;

&lt;p&gt;The main reason is these special indexes aren&apos;t supported by sbe currently, and we would replace an ix_scan with a collscan and incur a perf hit.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2045433">DOCS-15336</key>
            <summary>Investigate changes in SERVER-65960:  Fall back to classic engine when NLJ is chosen and disable SBE on the right of classic $lookup</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="alison.huh@mongodb.com">Alison Huh</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
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                <created>Thu, 12 May 2022 03:52:28 +0000</created>
                <updated>Mon, 13 Nov 2023 17:41:27 +0000</updated>
                            <resolved>Fri, 10 Feb 2023 15:48:22 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                    <fixVersion>6.0.0-rc9</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5186870" author="JIRAUSER1260472" created="Fri, 10 Feb 2023 15:48:22 +0000"  >&lt;p&gt;No changes to customer/user experience. SERVER ticket marked as downstream not needed.&lt;/p&gt;</comment>
                            <comment id="4596916" author="edu.bot" created="Mon, 6 Jun 2022 15:24:47 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65960&quot; title=&quot; Fall back to classic engine when NLJ is chosen&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65960&quot;&gt;&lt;del&gt;SERVER-65960&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
6.1.0-rc0, 6.0.0-rc9&lt;/p&gt;</comment>
                            <comment id="4596646" author="edu.bot" created="Mon, 6 Jun 2022 14:21:33 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65960&quot; title=&quot; Fall back to classic engine when NLJ is chosen&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65960&quot;&gt;&lt;del&gt;SERVER-65960&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
6.0.0-rc9&lt;/p&gt;</comment>
                            <comment id="4573338" author="edu.bot" created="Wed, 25 May 2022 19:42:03 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65960&quot; title=&quot; Fall back to classic engine when NLJ is chosen&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65960&quot;&gt;&lt;del&gt;SERVER-65960&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
6.0 Required&lt;/p&gt;</comment>
                            <comment id="4546690" author="edu.bot" created="Thu, 12 May 2022 23:42:50 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65960&quot; title=&quot; Fall back to classic engine when NLJ is chosen&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65960&quot;&gt;&lt;del&gt;SERVER-65960&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;/p&gt;</comment>
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