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    <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-69350] Include into the rowStoreExpr only the output fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-69350</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the rowStoreExpr in SlotBasedStageBuilder::buildColumnScan includes all fields, even those that are pushed down as per-path filters and don&apos;t participate in the output.&lt;/p&gt;

&lt;p&gt;This might affect correctness in some corner cases:&lt;br/&gt;
[&lt;br/&gt;
{$match: {x: {$lt: 42}}}, // will be lowered as a per-path filter&lt;br/&gt;
{$project: {_id: 1}}, // &quot;x&quot; should not be included into the output, but currently rowStoreExpr will keep it&lt;br/&gt;
{$group: {_id: &quot;$x&quot;, s: {$sum: 1}},&lt;br/&gt;
]&lt;br/&gt;
The result of the group would depend on whether &quot;x&quot; is included into the output or not. Currently we inject mkbson stage on top of column_scan that would remove &quot;x&quot; but as we are cleaning up the CSI plans and removing the unnecessary stages, the extra field from the rowStoreExpr might leak through.&#160;&lt;/p&gt;

&lt;p&gt;Also, the simpler the expr the better it is for perf.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2127073">SERVER-69350</key>
            <summary>Include into the rowStoreExpr only the output fields</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="irina.yatsenko@mongodb.com">Irina Yatsenko</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                    </labels>
                <created>Wed, 31 Aug 2022 23:03:26 +0000</created>
                <updated>Sun, 29 Oct 2023 21:33:44 +0000</updated>
                            <resolved>Tue, 20 Sep 2022 23:11:28 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4843674" author="xgen-internal-githook" created="Tue, 20 Sep 2022 22:58:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Irina Yatsenko&apos;, &apos;email&apos;: &apos;irina.yatsenko@mongodb.com&apos;, &apos;username&apos;: &apos;IrinaYatsenko&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69350&quot; title=&quot;Include into the rowStoreExpr only the output fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69350&quot;&gt;&lt;del&gt;SERVER-69350&lt;/del&gt;&lt;/a&gt; Only project output fields on fall back to the row store&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6c2f7a0a6bd5a24f08a44bef8972117c7dd4e9a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6c2f7a0a6bd5a24f08a44bef8972117c7dd4e9a4&lt;/a&gt;&lt;/p&gt;</comment>
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