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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-20219] Add startup warning to 3.0 if have indexes with partialFilterExpression option</title>
                <link>https://jira.mongodb.org/browse/SERVER-20219</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Creating an index on 3.0 with a &lt;tt&gt;partialFilterExpression&lt;/tt&gt; option (valid in 3.2 or not) should generate a startup warning that explains how the index will contain entries for all documents in the collection. It needs to be dropped and recreated after upgrading to 3.2 in order to actually be a partial index.&lt;/p&gt;

&lt;p&gt;If a 3.2 mongod is downgraded to 3.0, then any indexes that have a &lt;tt&gt;partialFilterExpression&lt;/tt&gt; option may not contain index entries for all documents in the collection. We should also generate a startup warning to explain that the index may need to be dropped and recreated to avoid missing documents when it used to answer queries on 3.0.&lt;/p&gt;</description>
                <environment></environment>
        <key id="227775">SERVER-20219</key>
            <summary>Add startup warning to 3.0 if have indexes with partialFilterExpression option</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Aug 2015 17:34:00 +0000</created>
                <updated>Tue, 13 Oct 2015 20:41:10 +0000</updated>
                            <resolved>Mon, 14 Sep 2015 22:29:09 +0000</resolved>
                                    <version>3.0.6</version>
                                    <fixVersion>3.0.7</fixVersion>
                                    <component>Admin</component>
                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1029525" author="xgen-internal-githook" created="Mon, 14 Sep 2015 22:23:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visemet&apos;, u&apos;name&apos;: u&apos;Max Hirschhorn&apos;, u&apos;email&apos;: u&apos;max.hirschhorn@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20219&quot; title=&quot;Add startup warning to 3.0 if have indexes with partialFilterExpression option&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20219&quot;&gt;&lt;del&gt;SERVER-20219&lt;/del&gt;&lt;/a&gt; Warn if an index has a partialFilterExpression option.&lt;/p&gt;

&lt;p&gt;Generate a warning on index creation and database startup if an index is&lt;br/&gt;
found to have a partialFilterExpression option because partial indexes&lt;br/&gt;
are not supported in 3.0.&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4ea8fda0b0b2ddbc33bf8782f2fa53c554e1c50e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4ea8fda0b0b2ddbc33bf8782f2fa53c554e1c50e&lt;/a&gt;&lt;/p&gt;</comment>
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