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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-63284] Optimize decoding from columnar format</title>
                <link>https://jira.mongodb.org/browse/SERVER-63284</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Decoding type and value information from the columnar format into SBE values will no doubt be a hot path. In the POC written by Mathias, one optimization involved using the case ranges gcc extension (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63281&quot; title=&quot;Add support for case ranges via macro&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63281&quot;&gt;&lt;del&gt;SERVER-63281&lt;/del&gt;&lt;/a&gt;). We should come back to this code path and take advantage of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63281&quot; title=&quot;Add support for case ranges via macro&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63281&quot;&gt;&lt;del&gt;SERVER-63281&lt;/del&gt;&lt;/a&gt; (if/when done) and make other optimizations as necessary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1977208">SERVER-63284</key>
            <summary>Optimize decoding from columnar format</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Feb 2022 23:47:19 +0000</created>
                <updated>Tue, 24 Jan 2023 20:39:54 +0000</updated>
                            <resolved>Tue, 24 Jan 2023 20:39:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4911200" author="justin.seyster" created="Tue, 18 Oct 2022 21:42:23 +0000"  >&lt;p&gt;My early experiments showed some promising results, but I wasn&apos;t able to reproduce them reliably. I think that variations in the function layout of the output binary were causing most of the performance differences I observed. In one test, I saw a 6% difference between the two versions I tested, even though I accidentally configured the test in a way that prevented it from using the column store index at all!&lt;/p&gt;

&lt;p&gt;To reduce the impact of i-cache effects on tests, I created a single binary that switches between the optimized and unoptimized versions of the columnar decoding function based on a feature flag. Testing on that binary did not show a significant change in performance. Based on that, I&apos;m putting this back on the backlog with the expectation that we probably won&apos;t implement it. Time permitting, it may be worthwhile to take a few more measurements once we have more benchmarks in place.&lt;/p&gt;</comment>
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