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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>
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<item>
            <title>[CDRIVER-329] add distinct helper to mongoc_collection_t</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-329</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;we need a helper for the distinct operation with mongoc_collection_t.&lt;/p&gt;</description>
                <environment></environment>
        <key id="128402">CDRIVER-329</key>
            <summary>add distinct helper to mongoc_collection_t</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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-c-driver">Backlog - C Driver Team</assignee>
                                    <reporter username="christian.hergert@10gen.com">Christian Hergert</reporter>
                        <labels>
                    </labels>
                <created>Sun, 30 Mar 2014 19:03:26 +0000</created>
                <updated>Tue, 18 Oct 2016 20:49:06 +0000</updated>
                            <resolved>Tue, 18 Oct 2016 20:49:06 +0000</resolved>
                                                    <fixVersion>1.5.0</fixVersion>
                                    <component>libmongoc</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1411991" author="jesse" created="Tue, 18 Oct 2016 20:49:06 +0000"  >&lt;p&gt;We&apos;re still doing this via &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1527&quot; title=&quot;Add mongoc_client_[read|write|read_write]_command_with_opts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1527&quot;&gt;&lt;del&gt;CDRIVER-1527&lt;/del&gt;&lt;/a&gt; instead.&lt;/p&gt;</comment>
                            <comment id="1388636" author="jesse" created="Tue, 20 Sep 2016 14:41:35 +0000"  >&lt;p&gt;These are good arguments for a helper function. My hope is that calling &quot;distinct&quot; via a new helper, &quot;mongoc_client_command_with_opts&quot; (&lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1527&quot; title=&quot;Add mongoc_client_[read|write|read_write]_command_with_opts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1527&quot;&gt;&lt;del&gt;CDRIVER-1527&lt;/del&gt;&lt;/a&gt;), will fulfill this requirement for drivers that wrap libmongoc. Same for any other command helper functions that you&apos;d normally need separate functions for.&lt;/p&gt;

&lt;p&gt;Note: we haven&apos;t signed on to the CRUD Spec. Complying more with the CRUD Spec is better than complying less with it, for sure, but we still make case-by-case decisions regarding its API.&lt;/p&gt;</comment>
                            <comment id="1388271" author="rassi@10gen.com" created="Tue, 20 Sep 2016 00:58:25 +0000"  >&lt;p&gt;Re-opening for another round of consideration.&lt;/p&gt;

&lt;p&gt;My argument for why this helper should exist:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The CRUD spec &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/crud/crud.rst#read&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mandates it&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;The C++ driver implements a distinct helper, and it would be convenient for the C++ distinct helper to not have to implement logic which is specific to server version, such as the requirement to raise an error if the user specifies a collation when connected to a deployment with a max wire version less than 5. It would be most natural for the C driver to provide a helper which implements this logic.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I&apos;d suggest the following prototype:&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;mongoc_cursor_t *mongoc_collection_distinct(&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;   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;	mongoc_collection_t *collection,&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;   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;	&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;char&lt;/span&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; *key,&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;   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;	&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; bson_t *opts,&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;	&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; mongoc_read_prefs_t *read_prefs) BSON_GNUC_WARN_UNUSED_RESULT;&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>
                            <comment id="1375847" author="bjori" created="Fri, 2 Sep 2016 17:29:17 +0000"  >&lt;p&gt;No.. Lets not. Its not healthy to have command helpers for every thing in the world (besides, we only have helpers for maybe 1/4th of all commands)&lt;/p&gt;

&lt;p&gt;Anyone who needs it should craft the command manually and use the run command interface instead&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="314650">CDRIVER-1527</issuekey>
        </issuelink>
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