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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>
    </build-info>


<item>
            <title>[SERVER-63552] Modify EqLookupNode in query solution to use FieldPath</title>
                <link>https://jira.mongodb.org/browse/SERVER-63552</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;EqLookupNode QSN uses string field names to represent field paths. This causes 2 problems:&lt;br/&gt;
1) It requires conversion from FieldPath to string when creating the node and then splitting it to the path again&lt;br/&gt;
2) It is misleading, and may suggest that the fields are just fields, rather than paths that require multiple getField and/or nested object creations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1981591">SERVER-63552</key>
            <summary>Modify EqLookupNode in query solution to use FieldPath</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="anna.wawrzyniak@mongodb.com">Anna Wawrzyniak</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Feb 2022 21:24:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:39 +0000</updated>
                            <resolved>Mon, 21 Mar 2022 07:14:11 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4424437" author="JIRAUSER1259274" created="Mon, 21 Mar 2022 16:59:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/pull/3910&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/pull/3910&lt;/a&gt; fixed this, it was merged with &lt;a href=&quot;https://github.com/mongodb/mongo/commit/ebb1f3900176b9df1f3c20646f349c9785914c43&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ebb1f3900176b9df1f3c20646f349c9785914c43&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4424006" author="david.storch" created="Mon, 21 Mar 2022 15:19:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=irina.yatsenko&quot; class=&quot;user-hover&quot; rel=&quot;irina.yatsenko&quot;&gt;irina.yatsenko&lt;/a&gt; was there a commit made against this ticket? I don&apos;t see a github link.&lt;/p&gt;</comment>
                            <comment id="4359929" author="JIRAUSER1263795" created="Wed, 16 Feb 2022 20:37:28 +0000"  >&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&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;
		&lt;tbody &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;  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;ExpressionFieldPath {&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;    ...&lt;/span&gt;&lt;/pre&gt;
			&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;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; FieldPath _fieldPath;&lt;/span&gt;&lt;/pre&gt;
			&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;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; Variables::Id _variable;&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;   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;};&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;so basically looks like ExpressionFieldPath is FieldPath + variable. And the only applicable variable would be Variables:kRootId, so this seems like an unnecessary degree of freedom, since we don&apos;t allow anything other than a FieldPath in $lookup.&lt;/p&gt;

&lt;p&gt;I think FieldPath is the best choice.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4359906" author="JIRAUSER1263795" created="Wed, 16 Feb 2022 20:31:26 +0000"  >&lt;p&gt;Great question. I&#8217;m not sure, it doesnt seem like there is a very domain separation ruels that we adhere too here.&lt;br/&gt;
both FieldPath and ExpressionFieldPath are defined in mongo/db/pipeline.&lt;/p&gt;

&lt;p&gt;The ExpressionFieldPath is part of the Expression hierarchy, so that makes me favor standalone FieldPath a bit more, especially for the &#8220;as&#8221; field, which we want to interpret very differently than Expression evaluation (we need to assemble newObjs there, rather than evaluate expression as is. Expression comes with exectuion logic, that we will be ignoring in this case.&lt;/p&gt;

&lt;p&gt;additionally, FieldPath already existed before group, (in the sort code) and in ReturnNode, so for archeological consistency reasons, I think it also makes sense to use it.&lt;/p&gt;</comment>
                            <comment id="4356921" author="JIRAUSER1259274" created="Tue, 15 Feb 2022 18:50:34 +0000"  >&lt;p&gt;Or should we store ExpressionFieldPath in EqLookupNode instead? &lt;/p&gt;</comment>
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