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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-27076] Query Planner uses inefficient plan for regular expression + sort with aggregations</title>
                <link>https://jira.mongodb.org/browse/SERVER-27076</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a collection has a compound index on a string field + a sort field and another index on just the sort field then an aggregation using a regular expression match will only use the index with just the sort field. This does not happen with the equivalent find command. Adding an index on sort field + string field doesn&apos;t improve performance. Changing the location of the sort in the aggregation also has no effect.&lt;/p&gt;

&lt;p&gt;The reason for both indexes is that some queries need to be able to do a find based just on the sort key.&lt;/p&gt;</description>
                <environment></environment>
        <key id="332397">SERVER-27076</key>
            <summary>Query Planner uses inefficient plan for regular expression + sort with aggregations</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="3">Duplicate</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="jakesjews">Jacob Jewell</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Nov 2016 21:13:51 +0000</created>
                <updated>Thu, 17 Nov 2016 19:31:52 +0000</updated>
                            <resolved>Thu, 17 Nov 2016 19:27:27 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1436876" author="charlie.swanson" created="Thu, 17 Nov 2016 19:31:52 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jakesjews&quot; class=&quot;user-hover&quot; rel=&quot;jakesjews&quot;&gt;jakesjews&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Unfortunately that is the only known workaround at this time. Note the problem here is that if your regex happened to match 90% of the collection, then a sort using the {created: 1} index would be the better choice. Only when the result set is small enough does it make sense to favor an in-memory (blocking) sort. Unfortunately, our aggregation optimizer is not sophisticated enough to determine the point where one becomes faster than the other, so it instead always chooses non-blocking, index-provided sorts when they are available.&lt;/p&gt;

&lt;p&gt;Please vote for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7568&quot; title=&quot;Aggregation framework favors non-blocking sorts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7568&quot;&gt;&lt;del&gt;SERVER-7568&lt;/del&gt;&lt;/a&gt; and continue to watch that issue for updates. Thanks!&lt;/p&gt;</comment>
                            <comment id="1436021" author="jakesjews" created="Wed, 16 Nov 2016 21:35:18 +0000"  >&lt;p&gt;Sorry about the duplicate issue you can close this one. Is the only way to work around this to add a $project? We have a pattern throughout our web app where users have an optional search textbox for serial numbers above reports. We don&apos;t want to hurt performance when the text search is empty so we need the ability to sort collections with or without a text search. Adding a conditional $project to all our queries based on the presence of a wildcard would be a pretty difficult task.&lt;/p&gt;</comment>
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;var bulk = db.items.initializeUnorderedBulkOp();&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;&amp;nbsp;&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;for (var i = 0; i &amp;lt; 10000000; i++) {&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;db.things&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;    .find({ name: /^999999/ })&lt;/span&gt;&lt;/pre&gt;
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