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    <title>MongoDB Jira</title>
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    <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-35891] Add failpoint to disable aggregation optimizations</title>
                <link>https://jira.mongodb.org/browse/SERVER-35891</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to test for errors caused by optimizations in the aggregation pipeline, we will add a failpoint to the aggregation pipeline that will disable optimization. This will allow the aggregation fuzzer to run queries against a version of mongo with optimizations turned on and one with optimizations turned off to compare their results.&lt;/p&gt;</description>
                <environment></environment>
        <key id="565307">SERVER-35891</key>
            <summary>Add failpoint to disable aggregation optimizations</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="varun.arora">Varun Arora</assignee>
                                    <reporter username="david.bradford@mongodb.com">David Bradford</reporter>
                        <labels>
                            <label>tig-skip-pointing</label>
                    </labels>
                <created>Thu, 28 Jun 2018 18:38:03 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:16 +0000</updated>
                            <resolved>Wed, 25 Jul 2018 17:55:36 +0000</resolved>
                                                    <fixVersion>4.1.2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1956493" author="xgen-internal-githook" created="Wed, 25 Jul 2018 17:53:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Varun Arora&apos;, &apos;email&apos;: &apos;varun.arora@10gen.com&apos;, &apos;username&apos;: &apos;avarun42&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35891&quot; title=&quot;Add failpoint to disable aggregation optimizations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35891&quot;&gt;&lt;del&gt;SERVER-35891&lt;/del&gt;&lt;/a&gt; add failpoints to disable aggregation optimizations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47a7e08012f57e471dff60d1933192786b54e50d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47a7e08012f57e471dff60d1933192786b54e50d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1936698" author="max.hirschhorn@10gen.com" created="Mon, 2 Jul 2018 15:55:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.bradford&quot; class=&quot;user-hover&quot; rel=&quot;david.bradford&quot;&gt;david.bradford&lt;/a&gt;, I was thinking we&apos;d just do #1 to skip calling &lt;tt&gt;Pipeline::optimize()&lt;/tt&gt; but would want to also know if #2 of skipping &lt;tt&gt;MatchExpression::optimize()&lt;/tt&gt; has implications on whether a $match stage can be split, reordered, or coalesced. If it can, then I think we&apos;ll want to do that one as well. #3 of always using a collection scan feels closer to a separate fuzzing project of comparing the query results of all explain plans.&lt;/p&gt;</comment>
                            <comment id="1934693" author="david.storch" created="Fri, 29 Jun 2018 13:12:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.bradford&quot; class=&quot;user-hover&quot; rel=&quot;david.bradford&quot;&gt;david.bradford&lt;/a&gt;, which set of optimizations specifically do we want to be able to inhibit? I could imagine the following:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Turn off Pipeline::optimize().&lt;/li&gt;
	&lt;li&gt;Turn off MatchExpression::optimize().&lt;/li&gt;
	&lt;li&gt;Circumvent access planning entirely, and just use a collection scan.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Which of these are planned as part of the aggregation fuzzer work? Also, please CC the query team on any relevant code reviews in this area.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="855037">SERVER-42197</issuekey>
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