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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-53764] Support spilling to disk in sbe::HashAggStage</title>
                <link>https://jira.mongodb.org/browse/SERVER-53764</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The slot-based execution (SBE) engine currently supports spilling to disk for large blocking sort operations, but we still need to extend the hash-based aggregation operation to be able to spill pieces of its hash table. The &lt;tt&gt;HashAggStage&lt;/tt&gt; has limited uses in plans constructed for find commands, but when we start using SBE to execute entire aggregation pipelines, we may choose a plan that implements MQL $group using &lt;tt&gt;sbe::HashAggStage&lt;/tt&gt;. When the application sets allowDiskUse to true, the system should spill to disk when its reaches its allotted memory for the hash-aggregation rather than failing the query.&lt;/p&gt;

&lt;p&gt;Note that as part of this work, we need to extend &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52793&quot; title=&quot;Collect resource consumption metrics for all SBE stages that sort data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52793&quot;&gt;&lt;del&gt;SERVER-52793&lt;/del&gt;&lt;/a&gt;. Namely, the &lt;tt&gt;HashAggStage&lt;/tt&gt; must report execution stats about how many keys it sorted (if we spill the hash table sorted by key) and about how many times it spilled data to disk.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1589254">SERVER-53764</key>
            <summary>Support spilling to disk in sbe::HashAggStage</summary>
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                                            <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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Jan 2021 20:49:50 +0000</created>
                <updated>Tue, 6 Dec 2022 01:39:18 +0000</updated>
                            <resolved>Fri, 25 Feb 2022 14:45:04 +0000</resolved>
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