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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-58580] Implement sub-object interleaving</title>
                <link>https://jira.mongodb.org/browse/SERVER-58580</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implement sub-object interleaving to compress BSON Documents.&lt;/p&gt;

&lt;p&gt;Determine a depth-first ordering of scalar field within a parent document. The binary stream should be interleaved with operation bytes belonging to separate fields based on this order.&lt;/p&gt;

&lt;p&gt;When a sub-field is out of values in current operation it will continue at next operation currently not used by any sub-stream. The ordering guarantees that this will belong to this sub-field.&lt;/p&gt;

&lt;p&gt;Interleaving ends when a EOO literal is read.&lt;/p&gt;

&lt;p&gt;Any change to the hierarchy of the parent BSON Document requires the interleaving to end. But it will re-start if a new BSON Document literal is written to the stream.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1820164">SERVER-58580</key>
            <summary>Implement sub-object interleaving</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="13201">Fixed</resolution>
                                        <assignee username="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Jul 2021 13:27:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:51 +0000</updated>
                            <resolved>Wed, 20 Oct 2021 15:52:12 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4121383" author="xgen-internal-githook" created="Wed, 13 Oct 2021 13:51:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58580&quot; title=&quot;Implement sub-object interleaving&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58580&quot;&gt;&lt;del&gt;SERVER-58580&lt;/del&gt;&lt;/a&gt; Decoding support for compressed subobjects in BSONColumn&lt;/p&gt;

&lt;p&gt;BSONColumn has been refactored to put the decoding state into a DecodingState class.&lt;/p&gt;

&lt;p&gt;A new control byte in the data stream has been added for entering &quot;interleaved&quot; mode where sub-elements are compressed separately.&lt;/p&gt;

&lt;p&gt;One DecodingState is set up for each scalar element in the reference interleaved Object. When decompressing we extract one value from each state to build the full BSONObj to return. We always scan in a fixed order.&lt;/p&gt;

&lt;p&gt;Control bytes in the binary stream corresponds to the DecodingState that needs to read the next value.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d9d70aaf89337e3e6a263abcc271d159fe857985&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d9d70aaf89337e3e6a263abcc271d159fe857985&lt;/a&gt;&lt;/p&gt;</comment>
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