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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>[DOCS-13183] Investigate changes in SERVER-33582: Add $bsonSize expression</title>
                <link>https://jira.mongodb.org/browse/DOCS-13183</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Adds a $bsonSize expression&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    The query team has discussed and agreed to the following syntax and semantics:&lt;br/&gt;
Name: $bsonSize&lt;br/&gt;
Rejected alternative names: $bsonElementSize, $bsonObjSize&lt;br/&gt;
This expression takes an expression that evaluates to an object, and return the size of the object in bytes when encoded as BSON.  The resulting size excludes any metadata in the document. Errors on non-nullish non-objects. If the expression is nullish, returns null. &lt;br/&gt;
Syntax:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ $bsonSize: &amp;lt;Expression&amp;gt; } &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;This will parse like all other unary expressions, and accept the argument by itself or as an array with one element.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;OriginalTicketDescription&quot;&gt;&lt;/a&gt;Original Ticket Description&lt;/h3&gt;
&lt;p&gt;Twice in the last week someone asked how to compute object size (in bytes) in aggregation.&lt;/p&gt;

&lt;p&gt;Once it was when they were trying to rewrite mapReduce job in agg (mapReduce has access to Object.bsonsize() method) and the other time when they were trying to compute in aggregation average size of certain oplog entries.&lt;/p&gt;

&lt;p&gt;Seems like it could be useful and simple enough if it does exactly what Object.bsonsize() method does.   Possible syntax: {&lt;tt&gt;$objSize:&amp;lt;expression-resolving-to-object&amp;gt;&lt;/tt&gt;}.  Alternative may be overloaded &lt;tt&gt;$bsonSize&lt;/tt&gt; expression which takes any type and returns its size in bytes (usable for scalar types, arrays, objects, etc)&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="984615">DOCS-13183</key>
            <summary>Investigate changes in SERVER-33582: Add $bsonSize expression</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="jeffrey.allen@mongodb.com">Jeffrey Allen</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-grab-bag</label>
                    </labels>
                <created>Wed, 30 Oct 2019 23:07:17 +0000</created>
                <updated>Mon, 13 Nov 2023 18:14:29 +0000</updated>
                            <resolved>Thu, 13 Feb 2020 19:06:51 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2877128" author="xgen-internal-githook" created="Thu, 13 Feb 2020 19:08:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jeff-allen-mongo&apos;, &apos;name&apos;: &apos;jeff-allen-mongo&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13183&quot; title=&quot;Investigate changes in SERVER-33582: Add $bsonSize expression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13183&quot;&gt;&lt;del&gt;DOCS-13183&lt;/del&gt;&lt;/a&gt;): Adding bsonSize expression&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/eab3ad8cf51e554c5322823b6039356a35f15fdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/eab3ad8cf51e554c5322823b6039356a35f15fdf&lt;/a&gt;&lt;/p&gt;</comment>
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