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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-2991] Nice to have bson fields returned in determined order to making loading into data type / object faster.</title>
                <link>https://jira.mongodb.org/browse/SERVER-2991</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the bson fields are in a known order then they can be mapped/loaded into the data type directly. Otherwise, you have to use a dictionary to map bson fields to object fields. Mongo could specify the order (eg. sorted) and the data type could be made to match that. Alternatively, a query with a projection (subset of fields to retrieve) can return documents with fields ordered the same as the projection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="16296">SERVER-2991</key>
            <summary>Nice to have bson fields returned in determined order to making loading into data type / object faster.</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="tonyh">Tony Hannan</reporter>
                        <labels>
                    </labels>
                <created>Sat, 23 Apr 2011 22:06:28 +0000</created>
                <updated>Tue, 6 Dec 2022 05:44:08 +0000</updated>
                                            <version>1.8.1</version>
                                    <fixVersion>features we&amp;#39;re not sure of</fixVersion>
                                    <component>Querying</component>
                                        <votes>3</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="29549" author="gregweber" created="Sat, 23 Apr 2011 22:32:26 +0000"  >&lt;p&gt;Just to clarify, we have an &quot;ORM&quot; with a MongoDB backend: &lt;a href=&quot;http://www.yesodweb.com/book/persistent&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.yesodweb.com/book/persistent&lt;/a&gt;. Many other ORMs will lazily access MongoDB fields from a hash so they don&apos;t care as much about ordering. In our case, we are immediately instantiating a data structure. So we need to match up all the mongo fields with the data structure fields. The fastest way is to have a guarantee on the ordering of the fields returned from the server. This could come from a guarantee that they won&apos;t change on update as part of addressing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2592&quot; title=&quot;The fields in a document are reordered (sorted alphabetically) when setting a field value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2592&quot;&gt;&lt;del&gt;SERVER-2592&lt;/del&gt;&lt;/a&gt;. Technically we could rely on the state of 2592 now to maintain an alphabetical ordering, but that seems ugly and could change with a new version of mongodb. Another solution would be to get the fields back in the same order in which a projection is specified.&lt;/p&gt;</comment>
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