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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-37100] Investigate a way to deal with pre-evaluation errors in optimization agg-fuzzer</title>
                <link>https://jira.mongodb.org/browse/SERVER-37100</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When running aggregation, the aggregation framework will pre-evaluate some of the arguments. During that pre-evaluation, it may encounter and throw an error. If optimizations are disabled via failpoints, however, the pre-evaluation phase does not happen and the error is not hit, instead the aggregation simply returns no documents.&lt;/p&gt;

&lt;p&gt;As a result, when the aggregation fuzzer is run in optimization mode, it frequently hits this discrepancy (one mongod throws an error and another returns 0 documents). &lt;/p&gt;

&lt;p&gt;One possible solution from &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; would be to add context to the error messages hit during pre-evaluation. The fuzzer could then check for that context and validate accordingly.&lt;/p&gt;

&lt;p&gt;This ticket is to investigate what it would take to implement that solution (or another solution if appropriate), make any needed changes to the mongo repo and open a ticket to update the aggregation fuzzer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="603272">SERVER-37100</key>
            <summary>Investigate a way to deal with pre-evaluation errors in optimization agg-fuzzer</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="robert.guo@mongodb.com">Robert Guo</assignee>
                                    <reporter username="david.bradford@mongodb.com">David Bradford</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Sep 2018 18:22:37 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:15 +0000</updated>
                            <resolved>Tue, 2 Oct 2018 16:16:07 +0000</resolved>
                                                    <fixVersion>4.1.4</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2020776" author="xgen-internal-githook" created="Tue, 2 Oct 2018 16:15:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Robert Guo&apos;, &apos;email&apos;: &apos;robert.guo@10gen.com&apos;, &apos;username&apos;: &apos;guoyr&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37100&quot; title=&quot;Investigate a way to deal with pre-evaluation errors in optimization agg-fuzzer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37100&quot;&gt;&lt;del&gt;SERVER-37100&lt;/del&gt;&lt;/a&gt; add context to agg pre-evaluation errors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/98cf14e795ec390182286f86edd7cf134325c81f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/98cf14e795ec390182286f86edd7cf134325c81f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2000989" author="charlie.swanson" created="Wed, 12 Sep 2018 18:39:30 +0000"  >&lt;p&gt;As a more blunt way to fix this, we could also consider it acceptable for one to return 0 documents and the other to return an error - but I&apos;d prefer the solution in the description if it&apos;s not too hard engineering-wise. At this point, I don&apos;t think it would be.&lt;/p&gt;</comment>
                            <comment id="2000952" author="david.bradford" created="Wed, 12 Sep 2018 18:23:40 +0000"  >&lt;p&gt;Here is an example of the failure: &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_aggregation_optimization_fuzzer_patch_626567bcde38521d76834db0c59e1aee62344b69_5b9923622fbabe77fd9660b1_18_09_12_14_32_30&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_aggregation_optimization_fuzzer_patch_626567bcde38521d76834db0c59e1aee62344b69_5b9923622fbabe77fd9660b1_18_09_12_14_32_30&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="603273">SERVER-37101</issuekey>
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