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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-59830] Share BSONColumn across BucketUnpackers in TrialStage</title>
                <link>https://jira.mongodb.org/browse/SERVER-59830</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58579&quot; title=&quot;Update BucketUnpacker to handle both compressed and uncompressed buckets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58579&quot;&gt;&lt;del&gt;SERVER-58579&lt;/del&gt;&lt;/a&gt; refactored the BucketUnpacker to use an `UnpackerImpl` interface to support a new `BSONColumn` type to support compression of time series columns. When &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58579&quot; title=&quot;Update BucketUnpacker to handle both compressed and uncompressed buckets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58579&quot;&gt;&lt;del&gt;SERVER-58579&lt;/del&gt;&lt;/a&gt; landed it wasn&apos;t clear how we can best share the bucketUnpacker in both branches of the TrialStage,&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/pull/426#discussion_r697471248&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/pull/426#discussion_r697471248&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;While the work done in each TrialStage might be a little different, if they share the same `BSONColumn` then any bucket that has been previously unpacked and hence uncompressed will be cached and should give a perf gain. We should see how we can best share the `BSONColumn` across multiple BucketUnapckers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1868896">SERVER-59830</key>
            <summary>Share BSONColumn across BucketUnpackers in TrialStage</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="eric.cox@mongodb.com">Eric Cox</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Sep 2021 01:43:44 +0000</created>
                <updated>Tue, 6 Dec 2022 00:57:10 +0000</updated>
                            <resolved>Wed, 8 Sep 2021 13:15:28 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4044652" author="eric.cox" created="Wed, 8 Sep 2021 13:15:28 +0000"  >&lt;p&gt;Since the BucketUnpackers in each branch will see different buckets due to the randomness in SampleFromTimeseries and the backup branch will be scanning the buckets, it turns out that this won&apos;t benefit from sharing a BSONColumn. The only time we should consider sharing BSONColumns is if we see the same buckets in each BucketUnpacker in lock-step. This isn&apos;t the case here so I&apos;m closing this ticket.&lt;/p&gt;

&lt;p&gt;cc: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henrik.edin&quot; class=&quot;user-hover&quot; rel=&quot;henrik.edin&quot;&gt;henrik.edin&lt;/a&gt;&lt;/p&gt;</comment>
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