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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-68968] Optimize column scan filter pushdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-68968</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Based on what we&apos;ve found in profiling, there are a few really simple optimizations for per-column filters that we should do.&lt;/p&gt;

&lt;p&gt;Here&apos;s a simple query on the bestbuy dataset which exercises the behavior. The filter does not match anything.&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;db.products.aggregate([{$match:{&apos;type&apos;: &apos;asdf&apos;}}, {$group:{_id:&apos;$type&apos;, count: {$sum:1}}}])&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;We should change this to not copy values out of the column index in order to apply the filter to them. This means putting an unowned value into the slot used for filtering &lt;a href=&quot;https://github.com/10gen/mongo/blob/65002ae2d4bacf9413383faa4b38d3480a2a8328/src/mongo/db/exec/sbe/stages/column_scan.cpp#L380-L383&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;


&lt;p&gt;These are only ideas for a starting point. We can also split these into separate tickets.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2117450">SERVER-68968</key>
            <summary>Optimize column scan filter pushdown</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="mohammad.dashti@mongodb.com">Mohammad Dashti</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Aug 2022 20:28:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:34:17 +0000</updated>
                            <resolved>Sun, 11 Sep 2022 23:24:02 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4817314" author="xgen-internal-githook" created="Sun, 11 Sep 2022 23:05:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mohammad Dashti&apos;, &apos;email&apos;: &apos;mdashti@gmail.com&apos;, &apos;username&apos;: &apos;mdashti&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68968&quot; title=&quot;Optimize column scan filter pushdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68968&quot;&gt;&lt;del&gt;SERVER-68968&lt;/del&gt;&lt;/a&gt; Avioded unnecessary copying slot values&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3cad68e7f4f687dc2f199622025998b7a4e4eff3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3cad68e7f4f687dc2f199622025998b7a4e4eff3&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2120534">SERVER-69105</issuekey>
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