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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-56757] $setWindowFields getting nondeterministic order of input would output nondeterministic result if &#8216;sortBy&#8217; a non-existing field</title>
                <link>https://jira.mongodb.org/browse/SERVER-56757</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the preceding stages generate output in nondeterministic order and &lt;b&gt;$setWindowFields&lt;/b&gt; has a default &#8216;partitionBy&#8217; and &#8216;sortBy&#8217; a non-existing field, $setWindowFields could generate inconsistent result every time the same pipeline is executed.&lt;/p&gt;

&lt;p&gt;Due to the same reason, disabling/enabling query optimization could also cause $setWindowFields producing inconsistent result. For example in BF-20745, consider a pipeline &lt;span class=&quot;error&quot;&gt;&amp;#91;*$bucket + $setWindowFields&amp;#93;&lt;/span&gt;* which will be desugared to the following pipeline: [ &lt;b&gt;$group + $sort ({&#8220;_id&#8221;: 1})&#160; + $sort + $_internalSetWindowFields ].&lt;/b&gt; The two adjacent $sort stages will be optimized to a single $sort by removing the first $sort. However, if the second $sort sorted a non-existing field, $_internalSetWindowFields would still get a non-deterministic order of input because $group does not order its output.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;It seems not a legit $setWindowFields bug, but it&#8217;s failing in some certain agg-fuzzers, e.g. aggregation_wildcard_fuzzer and aggregation_optimization_fuzzer.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1706692">SERVER-56757</key>
            <summary>$setWindowFields getting nondeterministic order of input would output nondeterministic result if &#8216;sortBy&#8217; a non-existing field</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="samuel.mercier@mongodb.com">Sam Mercier</assignee>
                                    <reporter username="ruoxin.xu@mongodb.com">Ruoxin Xu</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 May 2021 14:52:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:53 +0000</updated>
                            <resolved>Tue, 25 May 2021 21:38:41 +0000</resolved>
                                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4108156" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:58:39 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3840440" author="xgen-internal-githook" created="Wed, 26 May 2021 02:10:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;samontea&apos;, &apos;email&apos;: &apos;merciers.merciers@gmail.com&apos;, &apos;username&apos;: &apos;samontea&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56757&quot; title=&quot;$setWindowFields getting nondeterministic order of input would output nondeterministic result if &#8216;sortBy&#8217; a non-existing field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56757&quot;&gt;&lt;del&gt;SERVER-56757&lt;/del&gt;&lt;/a&gt; Add query knob to ensure that setWindowFields is in deterministic order for testing framework&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5929fa77a2393235b541f5c26747907822b5dfdd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5929fa77a2393235b541f5c26747907822b5dfdd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3839872" author="xgen-internal-githook" created="Tue, 25 May 2021 21:24:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;samontea&apos;, &apos;email&apos;: &apos;merciers.merciers@gmail.com&apos;, &apos;username&apos;: &apos;samontea&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56757&quot; title=&quot;$setWindowFields getting nondeterministic order of input would output nondeterministic result if &#8216;sortBy&#8217; a non-existing field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56757&quot;&gt;&lt;del&gt;SERVER-56757&lt;/del&gt;&lt;/a&gt; Add query knob to ensure that setWindowFields is in deterministic order for testing framework&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9d31696a31388af10b3351ac6f67ad1765d1d48c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9d31696a31388af10b3351ac6f67ad1765d1d48c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3822720" author="samuel.mercier" created="Mon, 24 May 2021 23:52:47 +0000"  >&lt;p&gt;We&apos;re going to implement a setParameter which will allow cause the `sortBy` to desugar to a `$sort` statement with and `, _id: 1` part appended. Then we will enable this setParameter with TIG-3025. &#160;&lt;/p&gt;</comment>
                            <comment id="3769667" author="julian.edwards" created="Wed, 12 May 2021 16:45:06 +0000"  >&lt;p&gt;Ignore that merge, my ticket was &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56575&quot; title=&quot;Make jasper resmoke work with windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56575&quot;&gt;&lt;del&gt;SERVER-56575&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="3768132" author="xgen-internal-githook" created="Wed, 12 May 2021 01:22:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;julianedwards&apos;, &apos;email&apos;: &apos;julian.edwards@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56757&quot; title=&quot;$setWindowFields getting nondeterministic order of input would output nondeterministic result if &#8216;sortBy&#8217; a non-existing field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56757&quot;&gt;&lt;del&gt;SERVER-56757&lt;/del&gt;&lt;/a&gt;: Make jasper resmoke work with windows&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b98b00f9d3d15f229762a9e2491a555fc9a7f93c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b98b00f9d3d15f229762a9e2491a555fc9a7f93c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3764001" author="nicholas.zolnierz" created="Mon, 10 May 2021 15:41:03 +0000"  >&lt;p&gt;Assigning to Sam as more of an investigating ticket. Our last brainstorm idea was to have the fuzzer append &quot;_id&quot; to the generated sort spec for $setWindowFields, such that the order of documents coming into the stage is reliable since the fuzzer appears to preserve the _id field. One caveat is that we&apos;ll need to perform the desugaring in the fuzzer since a compound sortBy is not allowed with several window functions.&lt;/p&gt;</comment>
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