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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-28758] Implement UpdateNode::mergeTrees()</title>
                <link>https://jira.mongodb.org/browse/SERVER-28758</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This should merge two &lt;tt&gt;UpdateNodes&lt;/tt&gt; and error if the trees cannot be merged. If the two nodes are &lt;tt&gt;UpdateObjectNodes&lt;/tt&gt;, children with the same field name are merged. Issue &lt;tt&gt;ErrorCodes::ConflictingUpdateOperators&lt;/tt&gt; if we ever try to merge two &lt;tt&gt;UpdateLeafNodes&lt;/tt&gt; or two &lt;tt&gt;UpdateNodes&lt;/tt&gt; of different types.&lt;/p&gt;

&lt;p&gt;For now, we assume &lt;tt&gt;UpdateArrayNode&lt;/tt&gt; does not exist.&lt;/p&gt;</description>
                <environment></environment>
        <key id="373547">SERVER-28758</key>
            <summary>Implement UpdateNode::mergeTrees()</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="9">Done</resolution>
                                        <assignee username="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Apr 2017 20:29:23 +0000</created>
                <updated>Thu, 12 Oct 2017 20:56:52 +0000</updated>
                            <resolved>Tue, 23 May 2017 15:02:35 +0000</resolved>
                                                    <fixVersion>3.5.8</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1577343" author="xgen-internal-githook" created="Tue, 23 May 2017 01:05:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jseyster&apos;, u&apos;name&apos;: u&apos;Justin Seyster&apos;, u&apos;email&apos;: u&apos;justin.seyster@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28758&quot; title=&quot;Implement UpdateNode::mergeTrees()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28758&quot;&gt;&lt;del&gt;SERVER-28758&lt;/del&gt;&lt;/a&gt; Add appendPart and removeLastPart operations to FieldRef&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ada47e8940993914048de342e830324cf456f3fd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ada47e8940993914048de342e830324cf456f3fd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1575897" author="xgen-internal-githook" created="Fri, 19 May 2017 22:31:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jseyster&apos;, u&apos;name&apos;: u&apos;Justin Seyster&apos;, u&apos;email&apos;: u&apos;justin.seyster@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28758&quot; title=&quot;Implement UpdateNode::mergeTrees()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28758&quot;&gt;&lt;del&gt;SERVER-28758&lt;/del&gt;&lt;/a&gt; createUpdateNodeByMerging throws instead of returning.&lt;/p&gt;

&lt;p&gt;We decided on a goal of moving towards exception throwing for&lt;br/&gt;
propagating instead of return values. We&apos;re starting off with this new&lt;br/&gt;
createUpdateNodeByMerging code path.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0acaccdf81a00222144253290f9cc3b4fd76e122&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0acaccdf81a00222144253290f9cc3b4fd76e122&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1567366" author="xgen-internal-githook" created="Mon, 8 May 2017 22:00:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jseyster&apos;, u&apos;name&apos;: u&apos;Justin Seyster&apos;, u&apos;email&apos;: u&apos;justin.seyster@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28758&quot; title=&quot;Implement UpdateNode::mergeTrees()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28758&quot;&gt;&lt;del&gt;SERVER-28758&lt;/del&gt;&lt;/a&gt; Implementation of createUpdateNodeByMerging().&lt;/p&gt;

&lt;p&gt;This initial implementation supports merging for UpdateObjectNodes. In&lt;br/&gt;
future iterations, we will add support for array nodes.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/11cf3870ff34f3d07cfb5eee3f91852cf160176c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/11cf3870ff34f3d07cfb5eee3f91852cf160176c&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="370807">SERVER-28621</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="373553">SERVER-28761</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="373564">SERVER-28763</issuekey>
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