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    <title>MongoDB Jira</title>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-12180] Clean up dependency tracking in agg</title>
                <link>https://jira.mongodb.org/browse/SERVER-12180</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This was a TODO following &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11675&quot; title=&quot;Aggregation framework support for text search&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11675&quot;&gt;&lt;del&gt;SERVER-11675&lt;/del&gt;&lt;/a&gt; (text in agg).&lt;/p&gt;</description>
                <environment></environment>
        <key id="103437">SERVER-12180</key>
            <summary>Clean up dependency tracking in agg</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Dec 2013 20:23:11 +0000</created>
                <updated>Mon, 11 Jul 2016 17:38:46 +0000</updated>
                            <resolved>Tue, 21 Jan 2014 18:08:17 +0000</resolved>
                                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="485121" author="xgen-internal-githook" created="Tue, 21 Jan 2014 20:09:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12180&quot; title=&quot;Clean up dependency tracking in agg&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12180&quot;&gt;&lt;del&gt;SERVER-12180&lt;/del&gt;&lt;/a&gt; fix inconsistent use of struct/class&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1299b1166ebc0856775566a4b7edd7b02b695734&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1299b1166ebc0856775566a4b7edd7b02b695734&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="485005" author="xgen-internal-githook" created="Tue, 21 Jan 2014 18:02:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12180&quot; title=&quot;Clean up dependency tracking in agg&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12180&quot;&gt;&lt;del&gt;SERVER-12180&lt;/del&gt;&lt;/a&gt; Clean up dependency tracking code&lt;/p&gt;

&lt;p&gt;Behavior changes (none effect semantics of pipeline, just implementation):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;We now track what we know about fields and metadata separately. This allows&lt;br/&gt;
  us to prove that we won&apos;t need the text score if we see a $group or $out.&lt;/li&gt;
	&lt;li&gt;If we don&apos;t need any fields from the source document we now use a projection&lt;br/&gt;
  that will return an empty document, or just the text score if it is needed.&lt;br/&gt;
  We used to use {_id: 0} which returned all other fields.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Code organization changes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Dependencies are now tracked using a dedicated struct rather than a&lt;br/&gt;
  set&amp;lt;string&amp;gt; with some magic strings.&lt;/li&gt;
	&lt;li&gt;ParsedDeps is now a proper class rather than a typedef.&lt;/li&gt;
	&lt;li&gt;Removed ExpressionFieldPath::_baseVar since its former role is fulfilled&lt;br/&gt;
  better by _variable.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d0037946dc103ffa648f7e8937f2c55351b03c53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d0037946dc103ffa648f7e8937f2c55351b03c53&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
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