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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CDRIVER-926] mongoc_collection_aggregate can return NULL</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-926</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-880&quot; title=&quot;mongoc_collection_aggregate might return a destroyed cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-880&quot;&gt;&lt;del&gt;CDRIVER-880&lt;/del&gt;&lt;/a&gt; we opted to hold true to our docs and return a valid cursor that would then result in failure once iterated over.&lt;/p&gt;

&lt;p&gt;However, mongoc_collection_aggregate() can return a NULL when the server preselection fails, and no error will be reported at all as we discard of the error from the preselect:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/blob/master/src/mongoc/mongoc-collection.c#L243-L251&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/blob/master/src/mongoc/mongoc-collection.c#L243-L251&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="233812">CDRIVER-926</key>
            <summary>mongoc_collection_aggregate can return 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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="bjori">Hannes Magnusson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Oct 2015 20:47:58 +0000</created>
                <updated>Tue, 24 Nov 2015 22:08:35 +0000</updated>
                            <resolved>Tue, 24 Nov 2015 22:08:25 +0000</resolved>
                                                    <fixVersion>1.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1097712" author="jesse" created="Tue, 24 Nov 2015 22:08:25 +0000"  >&lt;p&gt;Fixed along with &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-880&quot; title=&quot;mongoc_collection_aggregate might return a destroyed cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-880&quot;&gt;&lt;del&gt;CDRIVER-880&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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