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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>
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<item>
            <title>[SERVER-65658] Remove unnecessary null byte from columnar storage format</title>
                <link>https://jira.mongodb.org/browse/SERVER-65658</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For certain values in the columnar index, we store a BSONElement with an empty field name directly. The overhead of this empty field name is one byte (for the null terminator). There&apos;s no reason for us to store this null byte once per value, and for the case where many values are numeric/scalar, the space savings could be 10-20%.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2025398">SERVER-65658</key>
            <summary>Remove unnecessary null byte from columnar storage format</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="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, 14 Apr 2022 15:16:04 +0000</created>
                <updated>Tue, 24 Jan 2023 18:43:54 +0000</updated>
                            <resolved>Tue, 24 Jan 2023 18:43:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5137232" author="ian.boros" created="Tue, 24 Jan 2023 18:43:54 +0000"  >&lt;p&gt;We decided the improvement here would not be worth it.&lt;/p&gt;</comment>
                            <comment id="4796313" author="charlie.swanson" created="Thu, 1 Sep 2022 19:42:13 +0000"  >&lt;p&gt;I believe this byte is coming from here on the encoding side: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/04ea05b120dfbecccb01cf1d1363f25d9164abaf/src/mongo/db/index/column_cell.cpp#L164-L168&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/04ea05b120dfbecccb01cf1d1363f25d9164abaf/src/mongo/db/index/column_cell.cpp#L164-L168&lt;/a&gt;. I think the decoding logic is this part: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/04ea05b120dfbecccb01cf1d1363f25d9164abaf/src/mongo/db/storage/column_store.h#L500-L507&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/04ea05b120dfbecccb01cf1d1363f25d9164abaf/src/mongo/db/storage/column_store.h#L500-L507&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Unfortunately, the size of the index is not yet implemented yet (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/04ea05b120dfbecccb01cf1d1363f25d9164abaf/src/mongo/db/storage/wiredtiger/wiredtiger_column_store.cpp#L428-L440&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/04ea05b120dfbecccb01cf1d1363f25d9164abaf/src/mongo/db/storage/wiredtiger/wiredtiger_column_store.cpp#L428-L440&lt;/a&gt;), so it may be hard to quantify the impact of this. We could consider reviving the code that was there in the POC branch and resolving that TODO as part of this ticket: &lt;a href=&quot;https://github.com/10gen/mongo/blob/fc24ae382632fd385c325ce72c01376b70d3d966/src/mongo/db/storage/wiredtiger/wiredtiger_column_store.cpp#L551-L597&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/fc24ae382632fd385c325ce72c01376b70d3d966/src/mongo/db/storage/wiredtiger/wiredtiger_column_store.cpp#L551-L597&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I&apos;m not sure if the code will have to change at all or much from what was in the POC branch. It looks pretty reasonable to me at first glance, but someone from the server storage execution team may know if that code is appropriate. &lt;/p&gt;</comment>
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