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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-27207] Find on view with sort through mongos may incorrectly return empty result set</title>
                <link>https://jira.mongodb.org/browse/SERVER-27207</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A &lt;tt&gt;find()&lt;/tt&gt; with a &lt;tt&gt;sort()&lt;/tt&gt; on a &lt;tt&gt;mongos&lt;/tt&gt; may return an empty result set:&lt;/p&gt;
&lt;p/&gt;
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			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;WriteResult({ &quot;nInserted&quot; : 1 })&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongos&amp;gt; db.c.find()&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : ObjectId(&quot;583dc54dade9d2265ce2b196&quot;), &quot;x&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongos&amp;gt; db.createView(&quot;cView&quot;, &quot;c&quot;, [{$match : { x : {$gt : 0}}}])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;ok&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongos&amp;gt; db.cView.find()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : ObjectId(&quot;583dc54dade9d2265ce2b196&quot;), &quot;x&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;There&apos;s a simple workaround, which is to use the aggregation pipeline:&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : ObjectId(&quot;583dc54dade9d2265ce2b196&quot;), &quot;x&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="334909">SERVER-27207</key>
            <summary>Find on view with sort through mongos may incorrectly return empty result set</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="9">Done</resolution>
                                        <assignee username="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>34errata</label>
                            <label>read-only-views</label>
                    </labels>
                <created>Tue, 29 Nov 2016 18:03:33 +0000</created>
                <updated>Wed, 5 Apr 2017 11:42:50 +0000</updated>
                            <resolved>Thu, 1 Dec 2016 15:28:13 +0000</resolved>
                                                    <fixVersion>3.4.1</fixVersion>
                    <fixVersion>3.5.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="1446910" author="xgen-internal-githook" created="Thu, 1 Dec 2016 15:35:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27207&quot; title=&quot;Find on view with sort through mongos may incorrectly return empty result set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27207&quot;&gt;&lt;del&gt;SERVER-27207&lt;/del&gt;&lt;/a&gt; populate merge queue in AsyncResultsMerger when encountering ResolvedView&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1db6b26bcfdc67992c52739f50deacd31edc4fc0)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e941332d0c15cf498298de32d843bd6f409ddf7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e941332d0c15cf498298de32d843bd6f409ddf7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1446886" author="xgen-internal-githook" created="Thu, 1 Dec 2016 15:23:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27207&quot; title=&quot;Find on view with sort through mongos may incorrectly return empty result set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27207&quot;&gt;&lt;del&gt;SERVER-27207&lt;/del&gt;&lt;/a&gt; populate merge queue in AsyncResultsMerger when encountering ResolvedView&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1db6b26bcfdc67992c52739f50deacd31edc4fc0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1db6b26bcfdc67992c52739f50deacd31edc4fc0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1445957" author="kyle.suarez" created="Wed, 30 Nov 2016 17:13:30 +0000"  >&lt;p&gt;In &lt;tt&gt;AsyncResultsMerger::handleBatchResponse()&lt;/tt&gt;, we detect the view kickback error code from the primary shard and fill out a &lt;tt&gt;ClusterQueryResult&lt;/tt&gt; with the new resolved view. However, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0/src/mongo/s/query/async_results_merger.cpp#L470-L475&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we only fill out the &lt;tt&gt;docBuffer&lt;/tt&gt; of the remote&lt;/a&gt;. We don&apos;t touch the merge queue in any way, so it&apos;s left empty. If the query has a sort, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0/src/mongo/s/query/async_results_merger.cpp#L202&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we call &lt;tt&gt;AsyncResultsMerger::nextReadySorted()&lt;/tt&gt;&lt;/a&gt;, which consults the top of the merge queue. Since it&apos;s empty, it returns an empty result.&lt;/p&gt;

&lt;p&gt;There are a few ways we could fix this. Off the top of my head, we could also push &lt;tt&gt;remoteIndex&lt;/tt&gt; to &lt;tt&gt;_mergeQueue&lt;/tt&gt; when populating the result&apos;s view definition; or we could change the code to not go down the sorted codepath if a view&apos;s been discovered. I leave the strategy up to &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;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="326686">SERVER-26765</issuekey>
        </issuelink>
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