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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-65961] Copy only BSON types during yielding of SBE plans</title>
                <link>https://jira.mongodb.org/browse/SERVER-65961</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Imagine we have the following SBE 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;unwind s13 s14&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;project [s13 = if (getArraySize (s12) &amp;gt; 0, s12, [null])]&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;group [] [s12 = addToSet (s10)]&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;// Some part of the tree producing s10&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Basically, we are collecting some values into &lt;tt&gt;ArraySet&lt;/tt&gt; in s12, make a reference to s12 with s13 and then unwind &lt;tt&gt;ArraySet&lt;/tt&gt; from s13.&lt;/p&gt;

&lt;p&gt;Now imagine that after unwinding first N elements, yield happens. All values in the tree will be copied, including the value behind s13. Unwind will update its reference to &lt;tt&gt;ArraySet&lt;/tt&gt; to point to the freshly copied value and skip first N elements. The problem is, we have no guarantee that these N elements are in fact the same elements produced before, since &lt;tt&gt;ArraySet&lt;/tt&gt; does not have ordering guarantees.&lt;/p&gt;

&lt;p&gt;Since all non-BSON values are always owned by the SBE tree, it makes sense to copy only BSON values during yielding. This will also solve the problem outlined above.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2033213">SERVER-65961</key>
            <summary>Copy only BSON types during yielding of SBE plans</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="nikita.lapkov@mongodb.com">Nikita Lapkov</assignee>
                                    <reporter username="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                    </labels>
                <created>Tue, 26 Apr 2022 13:58:02 +0000</created>
                <updated>Sun, 29 Oct 2023 21:39:01 +0000</updated>
                            <resolved>Fri, 29 Apr 2022 13:16:42 +0000</resolved>
                                                    <fixVersion>6.0.0-rc4</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4517159" author="xgen-internal-githook" created="Fri, 29 Apr 2022 18:35:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nikita Lapkov&apos;, &apos;email&apos;: &apos;nikita.lapkov@mongodb.com&apos;, &apos;username&apos;: &apos;laplab&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65961&quot; title=&quot;Copy only BSON types during yielding of SBE plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65961&quot;&gt;&lt;del&gt;SERVER-65961&lt;/del&gt;&lt;/a&gt; Copy only BSON types during yielding of SBE plans&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a88230980fbeefa27f3b7cc07776650c6dfdb49f)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6017abecf4150fbf05778b15145aaf7141cf1b12&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6017abecf4150fbf05778b15145aaf7141cf1b12&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4514629" author="xgen-internal-githook" created="Thu, 28 Apr 2022 20:54:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nikita Lapkov&apos;, &apos;email&apos;: &apos;nikita.lapkov@mongodb.com&apos;, &apos;username&apos;: &apos;laplab&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65961&quot; title=&quot;Copy only BSON types during yielding of SBE plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65961&quot;&gt;&lt;del&gt;SERVER-65961&lt;/del&gt;&lt;/a&gt; Copy only BSON types during yielding of SBE plans&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a88230980fbeefa27f3b7cc07776650c6dfdb49f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a88230980fbeefa27f3b7cc07776650c6dfdb49f&lt;/a&gt;&lt;/p&gt;</comment>
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