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            <title>[SERVER-30898] Gate array sorting semantic changes behind featureCompatibilityVersion</title>
                <link>https://jira.mongodb.org/browse/SERVER-30898</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a mixed version sharded cluster, multiple shards can participate in the merge, each using different sorting semantics. Consider an aggregation that targets two shards, one is version 3.6 and one is version 3.4, then is merged by the 3.6 node. The results from the 3.4 node will come back in a different order than they would on the 3.6 node, but the 3.6 merging node will assume they are both sorted the same way, incorrectly using a &apos;merge presorted streams&apos; algorithm, for streams that aren&apos;t actually sorted.&lt;/p&gt;</description>
                <environment></environment>
        <key id="421944">SERVER-30898</key>
            <summary>Gate array sorting semantic changes behind featureCompatibilityVersion</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Aug 2017 18:19:25 +0000</created>
                <updated>Tue, 6 Dec 2022 03:53:05 +0000</updated>
                            <resolved>Tue, 5 Sep 2017 14:43:24 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1664459" author="david.storch" created="Tue, 5 Sep 2017 15:16:45 +0000"  >&lt;p&gt;Since array sorting semantics are not usefully or consistently defined in versions prior to 3.6, we do not believe it is important to preserve useful array sorting behavior in a mixed version 3.4/3.6 cluster. Users who fully upgrade to 3.6, however, should get a meaningful sort order when sorting on an array field. Closing as Won&apos;t Fix.&lt;/p&gt;</comment>
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