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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-3107] For JS, add a findRO() that returns a read-only object, which can be much faster for certain cases</title>
                <link>https://jira.mongodb.org/browse/SERVER-3107</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;if doing a find/read or find/insert in JS code, the JS object is considered writable.&lt;br/&gt;
This makes it slower for read access, and also on insert() whole object is translated back an forth to JS.&lt;br/&gt;
For example:&lt;br/&gt;
db.col.find.foreach(function(d) &lt;/p&gt;
{db.col2.insert(d)}
&lt;p&gt;)&lt;br/&gt;
will convert entire object from bson to JS then JS to bson.&lt;br/&gt;
Instead if an obj is explicitly marked as RO, we can reuse the exact same BSON.&lt;/p&gt;</description>
                <environment></environment>
        <key id="17146">SERVER-3107</key>
            <summary>For JS, add a findRO() that returns a read-only object, which can be much faster for certain cases</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="antoine">Antoine Girbal</assignee>
                                    <reporter username="antoine">Antoine Girbal</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 May 2011 20:37:41 +0000</created>
                <updated>Tue, 12 Jul 2016 00:19:02 +0000</updated>
                            <resolved>Thu, 26 May 2011 22:49:23 +0000</resolved>
                                                    <fixVersion>1.9.1</fixVersion>
                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="34669" author="antoine" created="Thu, 26 May 2011 22:49:23 +0000"  >&lt;p&gt;implemented as .readOnly() on cursor.&lt;br/&gt;
Only works in v8.&lt;br/&gt;
Checked that the same BSON is reused.&lt;/p&gt;</comment>
                            <comment id="34665" author="auto" created="Thu, 26 May 2011 22:28:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;agirbal&apos;, u&apos;name&apos;: u&apos;agirbal&apos;, u&apos;email&apos;: u&apos;antoine@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3107&quot; title=&quot;For JS, add a findRO() that returns a read-only object, which can be much faster for certain cases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3107&quot;&gt;&lt;del&gt;SERVER-3107&lt;/del&gt;&lt;/a&gt;: readOnly option to JS cursor, to reuse BSON as-is&lt;br/&gt;
Fixed named properties enumerator for readonly v8 object&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c775f5f250f9daa9bad803f738a5f6f351f4ca15&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c775f5f250f9daa9bad803f738a5f6f351f4ca15&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="32983" author="scotthernandez" created="Mon, 16 May 2011 21:25:41 +0000"  >&lt;p&gt;What about find().readOnly() instead?&lt;/p&gt;</comment>
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            <issuekey id="21113">SERVER-3629</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="21115">SERVER-3631</issuekey>
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