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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-85755] Block-enabled projection transitioning to scalar processing doesn&apos;t clean up the state</title>
                <link>https://jira.mongodb.org/browse/SERVER-85755</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a $project that supports processing block values, we first associate a slot id to the projected path, then, if we have to transition to scalar processing, we allocate a new slot to hold the sequence of scalar values coming out of that block thanks to the TsBlockToRow stage. However, the slot id holding the block value is still kept in the &quot;nodes&quot; variable that is used when assembling the result object, ending up at runtime with a block value passed to a call to makeBsonObj.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2557778">SERVER-85755</key>
            <summary>Block-enabled projection transitioning to scalar processing doesn&apos;t clean up the state</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="13201">Fixed</resolution>
                                        <assignee username="alberto.massari@mongodb.com">Alberto Massari</assignee>
                                    <reporter username="alberto.massari@mongodb.com">Alberto Massari</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Jan 2024 21:51:48 +0000</created>
                <updated>Wed, 7 Feb 2024 10:58:55 +0000</updated>
                            <resolved>Wed, 31 Jan 2024 19:59:03 +0000</resolved>
                                                    <fixVersion>8.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="6056910" author="xgen-internal-githook" created="Wed, 31 Jan 2024 19:24:15 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Alberto Massari&apos;, &apos;email&apos;: &apos;alberto.massari@mongodb.com&apos;, &apos;username&apos;: &apos;albymassari&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85755&quot; title=&quot;Block-enabled projection transitioning to scalar processing doesn&amp;#39;t clean up the state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85755&quot;&gt;&lt;del&gt;SERVER-85755&lt;/del&gt;&lt;/a&gt; Avoid that a ProjectStage references its own slots (#18524)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 38ff16ea3179906f0ddeef0f2f02542c2a7d6c2e&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a01e4de7134db0b6866373078f1cd151612df58c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a01e4de7134db0b6866373078f1cd151612df58c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="6048631" author="xgen-internal-githook" created="Mon, 29 Jan 2024 12:25:50 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Alberto Massari&apos;, &apos;email&apos;: &apos;alberto.massari@mongodb.com&apos;, &apos;username&apos;: &apos;albymassari&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85755&quot; title=&quot;Block-enabled projection transitioning to scalar processing doesn&amp;#39;t clean up the state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85755&quot;&gt;&lt;del&gt;SERVER-85755&lt;/del&gt;&lt;/a&gt; Ensure that vectorized slot are not visible to scalar stages (#18436)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: b48a7e749f91b1a7860da96da2315fdc10a96736&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e98fbc95d4de072c46a8440c39821e8d0cb95ec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e98fbc95d4de072c46a8440c39821e8d0cb95ec&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="2569621">SERVER-86339</issuekey>
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&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;   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.Collection1.explain().aggregate([{ $project: { &quot;obj.newField&quot;: &quot;$topLevelScalar&quot; } }, { $project: { &quot;obj.a&quot;: 0 } }]);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;generates the plan&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;[4] project [s14 = makeBsonObj(MakeObjSpec([obj = MakeObj([a], Open, RetInput)], [_id, obj], Closed, RetInput), null, true, s8, s13)] &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;[3] project [s13 = getField(s12, \&quot;obj\&quot;)] &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;[3] project [s12 = makeBsonObj(MakeObjSpec([obj = MakeObj([newField = Arg(0)], Closed)], [obj], Closed), null, true, s9, s7)] &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;[3] block_to_row blocks[s3, s4, s7, s5] row[s8, s9, s10, s11] &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;[3] project [s7 = cellFoldValues_P(cellBlockGetFlatValuesBlock(s5), s5)] &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;[2] ts_bucket_to_cellblock s1 pathReqs[s3 = ProjectPath(Get(_id)/Id), s4 = ProjectPath(Get(obj)/Id), s5 = ProjectPath(Get(topLevelScalar)/Id)]&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;   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;[1] scan s1 s2 none none none none none none lowPriority [] @\&quot;be9e4531-c681-4da5-b7db-8326db4ad559\&quot; true false&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;where makeBsonObj uses s7 instead of s10&lt;/p&gt;</customfieldvalue>

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