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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-65501] BSONColumnBuilder stores objects as scalars when field was previously encountered as scalar</title>
                <link>https://jira.mongodb.org/browse/SERVER-65501</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Storing the following values in BSONColumn opens object compression with a single interleaved stream for &quot;x&quot;:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;The {&lt;tt&gt;&quot;y&quot;: 2, &quot;z&quot;: 3&lt;/tt&gt;} in the third and forth object are stored as uncompressed scalars in that single interleaved stream.&lt;/p&gt;

&lt;p&gt;However, if the ordering of appends were reversed:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;We would start with object compression with two streams and end it when the third object is encountered and restart object compression with a single stream for &quot;x&quot; as a scalar.&lt;/p&gt;

&lt;p&gt;The behavior should be the same regardless of order. When going from scalar to object we should also re-start object compression.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2023589">SERVER-65501</key>
            <summary>BSONColumnBuilder stores objects as scalars when field was previously encountered as scalar</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>Tue, 12 Apr 2022 19:27:07 +0000</created>
                <updated>Sun, 29 Oct 2023 21:39:35 +0000</updated>
                            <resolved>Tue, 26 Apr 2022 19:53:17 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4510833" author="xgen-internal-githook" created="Wed, 27 Apr 2022 18:48:27 +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-65501&quot; title=&quot;BSONColumnBuilder stores objects as scalars when field was previously encountered as scalar&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65501&quot;&gt;&lt;del&gt;SERVER-65501&lt;/del&gt;&lt;/a&gt; Re-start interleaved object compression when scalar field is encountered as object&lt;/p&gt;

&lt;p&gt;This makes the behavior the same as when going from object to scalar.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8566a0723be819ade9a79b5c5c4d60590e4a895e)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aa0eff62c534fba56b437a2e046ce91f08d082ef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aa0eff62c534fba56b437a2e046ce91f08d082ef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4501009" author="xgen-internal-githook" created="Fri, 22 Apr 2022 20:43:22 +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-65501&quot; title=&quot;BSONColumnBuilder stores objects as scalars when field was previously encountered as scalar&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65501&quot;&gt;&lt;del&gt;SERVER-65501&lt;/del&gt;&lt;/a&gt; Re-start interleaved object compression when scalar field is encountered as object&lt;/p&gt;

&lt;p&gt;This makes the behavior the same as when going from object to scalar.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8566a0723be819ade9a79b5c5c4d60590e4a895e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8566a0723be819ade9a79b5c5c4d60590e4a895e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4493554" author="xgen-internal-githook" created="Wed, 20 Apr 2022 10:26:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Uladzimir Makouski&apos;, &apos;email&apos;: &apos;uladzimir.makouski@mongodb.com&apos;, &apos;username&apos;: &apos;umakouski&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65501&quot; title=&quot;BSONColumnBuilder stores objects as scalars when field was previously encountered as scalar&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65501&quot;&gt;&lt;del&gt;SERVER-65501&lt;/del&gt;&lt;/a&gt; Re-start interleaved object compression when scalar field is encountered as object&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 31864e3866ce9cc54c08463019846ded2ad9e6e5.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4caee7fb10e974d331b343a7aae06ba9fde439b6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4caee7fb10e974d331b343a7aae06ba9fde439b6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4490780" author="xgen-internal-githook" created="Tue, 19 Apr 2022 13:23:35 +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-65501&quot; title=&quot;BSONColumnBuilder stores objects as scalars when field was previously encountered as scalar&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65501&quot;&gt;&lt;del&gt;SERVER-65501&lt;/del&gt;&lt;/a&gt; Re-start interleaved object compression when scalar field is encountered as object&lt;/p&gt;

&lt;p&gt;This makes the behavior the same as when going from object to scalar.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/31864e3866ce9cc54c08463019846ded2ad9e6e5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/31864e3866ce9cc54c08463019846ded2ad9e6e5&lt;/a&gt;&lt;/p&gt;</comment>
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