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    <title>MongoDB Jira</title>
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    <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-9380] Add single-type arrays</title>
                <link>https://jira.mongodb.org/browse/SERVER-9380</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Type information in BSON carries a storage overhead with it.  By creating an array that has a single datatype inside of it, the repeated type information can be removed, allowing for much more efficient storage data that has a single type.  Note that these arrays should have all of the same functionality and operators as normal arrays.&lt;/p&gt;</description>
                <environment></environment>
        <key id="72147">SERVER-9380</key>
            <summary>Add single-type arrays</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="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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="andrew.emil@10gen.com">Andrew Emil</reporter>
                        <labels>
                    </labels>
                <created>Wed, 17 Apr 2013 20:21:29 +0000</created>
                <updated>Tue, 6 Dec 2022 05:21:55 +0000</updated>
                                                            <fixVersion>features we&amp;#39;re not sure of</fixVersion>
                                    <component>Storage</component>
                                        <votes>4</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="711551" author="justanyone" created="Thu, 4 Sep 2014 15:53:23 +0000"  >&lt;p&gt;Operations required on the array types are as follows.&lt;/p&gt;

&lt;p&gt;First, we decide that front is rightmost and back is leftmost.  it can work the other way, but for this ticket, presume it is this way.&lt;/p&gt;

&lt;p&gt;Operations required here are to enable this single-type array to be a queue or a stack. &lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Add array of new values to end&lt;/li&gt;
	&lt;li&gt;Pull n values from end, returns array&lt;/li&gt;
	&lt;li&gt;add array of new values to front&lt;/li&gt;
	&lt;li&gt;pull n values from front, returns array&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;All the above operations should take as input an array of new values, and return an array of values&lt;/p&gt;

&lt;p&gt;&lt;b&gt;CIRCULAR QUEUE:&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;There&apos;s another use-case where it&apos;s a limited-size queue, keeping the most recent elements.  This seems widely useful for people that only need to keep the n most recent values.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Push/Pull - simultaneous push onto one side and pop from the other.  Takes array of values to add.  Returns elements popped.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;OPTIONAL:  INSERT/DELETE RANDOM ELEMENTS&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Another probably much frequent use-case is for acting on subsets of the data, passing in lists of element numbers to pop, or lists of element numbers to insert at specific locations.  &lt;/p&gt;

&lt;p&gt;&lt;b&gt;OPTIONAL:  STORING NULL VALUES&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Single-data type arrays of numbers are useful for many people.  There&apos;s an additional use for them, which is storing time-series data.  In this case, it&apos;s also VERY useful to store NULL values specially.  This denotes that we have no data for that time slot.  It would be very nice to have this as a special value in the array, but it&apos;s not required, as we can indicate this with some special floating-point value like max-float or max-int.&lt;/p&gt;
</comment>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="222150">MONGOID-4030</issuekey>
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                                        <issuelink>
            <issuekey id="66342">SERVER-8716</issuekey>
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            <issuekey id="71649">SERVER-9342</issuekey>
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