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            <title>[SERVER-4508] In new aggregation framework, when execute $unwind for an empty array ([]), got assertion exception (&quot;exception: assertion db/pipeline/document_source_unwind.cpp:165&quot;)</title>
                <link>https://jira.mongodb.org/browse/SERVER-4508</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment>OSX 10.6</environment>
        <key id="26725">SERVER-4508</key>
            <summary>In new aggregation framework, when execute $unwind for an empty array ([]), got assertion exception (&quot;exception: assertion db/pipeline/document_source_unwind.cpp:165&quot;)</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="cwestin">Chris Westin</assignee>
                                    <reporter username="xiaofeng">Xiaofeng Wu</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Dec 2011 02:25:34 +0000</created>
                <updated>Mon, 11 Jul 2016 18:32:25 +0000</updated>
                            <resolved>Fri, 30 Dec 2011 19:38:55 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="76870" author="cwestin" created="Fri, 30 Dec 2011 19:39:27 +0000"  >&lt;p&gt;Verified the unwinder is no longer necessary in the current implementation of clonePath().&lt;/p&gt;</comment>
                            <comment id="76868" author="auto" created="Fri, 30 Dec 2011 19:38:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;cwestin&apos;, u&apos;name&apos;: u&apos;U-tellus\\cwestin&apos;, u&apos;email&apos;: u&apos;cwestin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4508&quot; title=&quot;In new aggregation framework, when execute $unwind for an empty array ([]), got assertion exception (&amp;quot;exception: assertion db/pipeline/document_source_unwind.cpp:165&amp;quot;)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4508&quot;&gt;&lt;del&gt;SERVER-4508&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cdb28667df845b9359e6f5127d0aec69d212afb2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cdb28667df845b9359e6f5127d0aec69d212afb2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="74088" author="xiaofeng" created="Sat, 17 Dec 2011 00:06:11 +0000"  >&lt;p&gt;by commented out line 165 for &quot;document_source_unwind.cpp&quot; and recompile, I got this framework to work. Now it handles empty array correctly.&lt;/p&gt;</comment>
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            <issuekey id="10927">SERVER-447</issuekey>
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