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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33582] Add $bsonSize expression</title>
                <link>https://jira.mongodb.org/browse/SERVER-33582</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;
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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;</description>
                <environment></environment>
        <key id="504223">SERVER-33582</key>
            <summary>Add $bsonSize expression</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="13201">Fixed</resolution>
                                        <assignee username="david.percy@mongodb.com">David Percy</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>asya</label>
                            <label>expression</label>
                            <label>pm1457</label>
                    </labels>
                <created>Thu, 1 Mar 2018 18:30:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:17 +0000</updated>
                            <resolved>Thu, 12 Dec 2019 17:25:04 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>9</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="2602080" author="xgen-internal-githook" created="Thu, 12 Dec 2019 17:19:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;, &apos;username&apos;: &apos;dpercy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33582&quot; title=&quot;Add $bsonSize expression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33582&quot;&gt;&lt;del&gt;SERVER-33582&lt;/del&gt;&lt;/a&gt; Add $bsonSize expression&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/82fb9653c610121a770ebe5988b3ef3a3e19b6bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/82fb9653c610121a770ebe5988b3ef3a3e19b6bd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1820140" author="asya" created="Thu, 1 Mar 2018 18:36:44 +0000"  >&lt;p&gt;If it handled any type, it would be a solution for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30967&quot; title=&quot;Add $binarySize expression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30967&quot;&gt;&lt;del&gt;SERVER-30967&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Also then we could get rid of &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/strLenBytes/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$strLenBytes&lt;/a&gt; and rename/alias $strLenCP to just $strLen.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="55257">SERVER-7549</issuekey>
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