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            <title>[SERVER-27496] allow self-$lookup on shard key value equality pre-merge on a sharded collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-27496</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In cases where there is no merge stage (or we are before it), it may be possible to allow self-lookup on sharded collection if the local and foreign field is the same and it&apos;s the shard key.&lt;/p&gt;
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        <key id="340604">SERVER-27496</key>
            <summary>allow self-$lookup on shard key value equality pre-merge on a sharded collection</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
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                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
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                <created>Thu, 22 Dec 2016 15:30:31 +0000</created>
                <updated>Tue, 6 Dec 2022 04:09:01 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>10</watches>
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