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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[CXX-1564] Cannot set use_cursor or batch_size with aggregation cursor</title>
                <link>https://jira.mongodb.org/browse/CXX-1564</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;After upgrading to C Driver 1.9.0, the C++ Driver can no longer set use_cursor or batch_size with options::aggregate. If it sets only batch_size, the batch_size is not actually sent with the initial aggregate command. If it sets use_cursor, then the &quot;cursor&quot; field is included in the aggregate command twice, causing a server error.&lt;/p&gt;

&lt;p&gt;The problem arose when the C Driver dropped support for old MongoDB versions. Its aggregate logic changed to &lt;b&gt;always&lt;/b&gt; include the cursor field. This obsoletes the C++ driver&apos;s use_cursor option and violates the C++ driver&apos;s assumption about how to pass batch_size field.&lt;/p&gt;

&lt;p&gt;Remove the use_cursor option, and if batch_size is set then add the &quot;batchSize&quot; field directly to the top level of the &quot;opts&quot; BSON document passed to mongoc_collection_aggregate, rather than wrapping it in a &quot;cursor&quot; document.&lt;/p&gt;</description>
                <environment></environment>
        <key id="532593">CXX-1564</key>
            <summary>Cannot set use_cursor or batch_size with aggregation cursor</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="13201">Fixed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Apr 2018 16:12:56 +0000</created>
                <updated>Sat, 28 Oct 2023 11:27:28 +0000</updated>
                            <resolved>Fri, 18 May 2018 17:52:38 +0000</resolved>
                                    <version>3.2.0</version>
                                    <fixVersion>3.3.0-rc0</fixVersion>
                                    <component>API</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1895602" author="xgen-internal-githook" created="Fri, 18 May 2018 17:53:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ajdavis&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-1564&quot; title=&quot;Cannot set use_cursor or batch_size with aggregation cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-1564&quot;&gt;&lt;del&gt;CXX-1564&lt;/del&gt;&lt;/a&gt; Reenable options::aggregate::batch_size&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/commit/ae46c1dbb002207a5a4762876643e65178a4c44e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/commit/ae46c1dbb002207a5a4762876643e65178a4c44e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1871508" author="jesse" created="Mon, 23 Apr 2018 16:15:07 +0000"  >&lt;p&gt;Once done, in test/sessions.cpp set the aggregate batch size to 2 so we can be certain that the right lsid is sent with the aggregate command&apos;s getMore. Add to the aggregate section:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        // An aggregate and a getMore.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        REQUIRE(test.events.size() &amp;gt;= 2);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Also add asserts in this section in collection_mocked.cpp:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;SECTION(&quot;Aggregate&quot;, &quot;[Collection::aggregate]&quot;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="524498">CXX-1552</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="470761">CXX-1485</issuekey>
        </issuelink>
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