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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-6464] should $ifNull accept [] as null?</title>
                <link>https://jira.mongodb.org/browse/SERVER-6464</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="44287">SERVER-6464</key>
            <summary>should $ifNull accept [] as null?</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="matt.dannenberg">Matt Dannenberg</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Jul 2012 19:36:38 +0000</created>
                <updated>Fri, 26 Jul 2013 14:08:27 +0000</updated>
                            <resolved>Sun, 16 Sep 2012 19:15:32 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="389344" author="ihristov" created="Fri, 26 Jul 2013 14:08:27 +0000"  >&lt;p&gt;what would be nice is to have $ifNullOrEmpty operator&lt;/p&gt;</comment>
                            <comment id="164834" author="eliot" created="Sun, 16 Sep 2012 19:15:32 +0000"  >&lt;p&gt;[] is not null&lt;/p&gt;</comment>
                            <comment id="143419" author="mattd@10gen.com" created="Mon, 16 Jul 2012 20:04:03 +0000"  >&lt;p&gt;The main reason I think it might be useful is when you $unwind a field that has an empty array you get no resulting documents. Currently as a workaround you&apos;d have to do two $projects: one with an $ifNull on the field and a $cond where you check to see if the field is $eq to []. In both cases give an array with a throwaway value in it. If $ifNull accepted [] as null, then only one of these pipeline elements would be needed.&lt;/p&gt;

&lt;p&gt;This is useful for cases where you need to collect all values of a top level field and all values of a nested field in an array of objects where the array may be empty.&lt;/p&gt;</comment>
                            <comment id="143413" author="schwerin" created="Mon, 16 Jul 2012 19:52:17 +0000"  >&lt;p&gt;In javascript, [] is not null.  I&apos;m inclined to say that&apos;s the way we want it, but can you provide some context in the description?&lt;/p&gt;</comment>
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