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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-14255] Allow storing aggregation pipelines as documents in MongoDB</title>
                <link>https://jira.mongodb.org/browse/SERVER-14255</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it&apos;s not possible to store MongoDB&apos;s own aggregation pipelines due to the limitation that field names cannot start with a &quot;$&quot; symbol, and cannot contain a &quot;.&quot; symbol either.&lt;/p&gt;

&lt;p&gt;For MongoDB to become the one-stop-shop for data storage, aggregation, massaging this is an unnecessary limitation that we should fix.&lt;/p&gt;

&lt;p&gt;Usage example: I want to build an app using custom / reusable aggregation pipelines that I can mix and match to get different views into my dataset. &lt;/p&gt;

&lt;p&gt;My current workaround is to replace all &quot;$&quot; symbols with &quot;#&quot; in MongoDB and recursively replace them back to &quot;$&quot; on the client. This is clumsy and expensive. I have not yet needed dot-notation fields.&lt;/p&gt;

&lt;p&gt;Two suggestions: &lt;br/&gt;
a) either lift the limitations of storing field names with $-prefix and dots (could be escaped to not confuse with operators ($set, $push, etc), like &lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    pipeline: [ {&quot;\$match&quot;: {foo\.bar: 1} }, {&quot;\$group&quot;: {_id: &quot;bar&quot;, ...} } ],&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;b) or offer an alternative aggregation reserved symbol (# instead of $). For this alternative, we could allow both for the time being to not break backwards compatibility. This doesn&apos;t solve the dotted field name problem however.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="142157">SERVER-14255</key>
            <summary>Allow storing aggregation pipelines as documents in MongoDB</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="thomas.rueckstiess@mongodb.com">Thomas Rueckstiess</reporter>
                        <labels>
                    </labels>
                <created>Sat, 14 Jun 2014 19:57:06 +0000</created>
                <updated>Tue, 6 Dec 2022 05:04:47 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Usability</component>
                                        <votes>2</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="621540" author="thomasr" created="Sat, 14 Jun 2014 19:59:05 +0000"  >&lt;p&gt;Also notice that the profiler is allowed to store $-prefixed keys in system.profile from aggregation commands. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8436&quot; title=&quot;Aggregation pipeline cannot process system.profile doc fields with $ prefixes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8436&quot;&gt;SERVER-8436&lt;/a&gt;.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="414602">SERVER-30575</issuekey>
        </issuelink>
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            <issuekey id="64043">SERVER-8436</issuekey>
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