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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-78887] Support yield/unyield for TsBucketToCellBlockStage / ValueBlock</title>
                <link>https://jira.mongodb.org/browse/SERVER-78887</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="2389372">SERVER-78887</key>
            <summary>Support yield/unyield for TsBucketToCellBlockStage / ValueBlock</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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Jul 2023 07:05:46 +0000</created>
                <updated>Sun, 29 Oct 2023 21:18:58 +0000</updated>
                            <resolved>Thu, 3 Aug 2023 01:26:51 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5609236" author="xgen-internal-githook" created="Thu, 3 Aug 2023 01:07:11 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78887&quot; title=&quot;Support yield/unyield for TsBucketToCellBlockStage / ValueBlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78887&quot;&gt;&lt;del&gt;SERVER-78887&lt;/del&gt;&lt;/a&gt; Support yielding for TsBucketToCellBlock and BlockToRow stages&lt;br/&gt;
Branch: minh.luu-no_compile_sys-perf&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/00d62e3c49ea299e68b9178fc5c8b3b6e4a38b52&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/00d62e3c49ea299e68b9178fc5c8b3b6e4a38b52&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5609184" author="xgen-internal-githook" created="Thu, 3 Aug 2023 00:31:50 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78887&quot; title=&quot;Support yield/unyield for TsBucketToCellBlockStage / ValueBlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78887&quot;&gt;&lt;del&gt;SERVER-78887&lt;/del&gt;&lt;/a&gt; Support yielding for TsBucketToCellBlock and BlockToRow stages&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/00d62e3c49ea299e68b9178fc5c8b3b6e4a38b52&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/00d62e3c49ea299e68b9178fc5c8b3b6e4a38b52&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5560425" author="ian.boros" created="Wed, 12 Jul 2023 14:16:48 +0000"  >&lt;p&gt;Copy-pasting my PR comment:&lt;/p&gt;

&lt;p&gt;I forgot to mention, this stage will interact with yielding/getNexts in a fun way. Imagine I have the following 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;block_to_row [s1 -&amp;gt; s2]&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;ts_bucket_to_cellblock a=s1&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;scan ...&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;I can run this plan, pull a bucket out of storage, return some data through block_to_row, and then fill up a getMore batch midway through processing one bucket. This means the underlying BSON will disappear, and the cursor we opened on the ValueBlock may become invalidated if it&apos;s pointing to storage-owned memory.&lt;/p&gt;

&lt;p&gt;The way I was planning to solve this actually used the extract() API. Every time block_to_row gets a new bucket, we extract() it, which returns a vector of unowned tag/values. We remember our index into that vector, and return the i&apos;th one each call to getNext(). When a yield occurs, we call value::copy() on values i through the last one and proceed as normal.&lt;/p&gt;

&lt;p&gt;There are other options, like complicating Cursor but IMO this one is pretty straightforward, even if it means adding extract() back for this patch. Other thoughts?&lt;/p&gt;</comment>
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