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    <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-72181] [SBE] Investigate replacing usages of std::containers with absl::containers</title>
                <link>https://jira.mongodb.org/browse/SERVER-72181</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In SBE we seem to use std::hash_containers instead of the corresponding absl:: ones. This task is to investigate whether we can replace those usages, or to document why we need to keep them as-is.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2213808">SERVER-72181</key>
            <summary>[SBE] Investigate replacing usages of std::containers with absl::containers</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 16 Dec 2022 15:20:32 +0000</created>
                <updated>Tue, 24 Jan 2023 19:59:23 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5060339" author="kyle.suarez" created="Fri, 16 Dec 2022 15:22:20 +0000"  >&lt;p&gt;Had a conversation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=martin.neupauer%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;martin.neupauer@mongodb.com&quot;&gt;martin.neupauer@mongodb.com&lt;/a&gt; about this:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;We think there are two usages, in hash lookup and hash join&lt;/li&gt;
	&lt;li&gt;Hash lookup can probably be replaced easily with Abseil&lt;/li&gt;
	&lt;li&gt;Hash join may actually depend on the fact that std:: container iterators have a stability guarantee, but we&apos;d need to investigate further&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note that we also filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72180&quot; title=&quot;[SBE] Investigate replacing hash join data structures with a custom hash table&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72180&quot;&gt;SERVER-72180&lt;/a&gt; to see if it would be better to forgo either the std:: or absl:: containers with a custom-built one.&lt;/p&gt;</comment>
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