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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>[JAVA-2429] DBCollection.distinct() fails when a null value is in the result</title>
                <link>https://jira.mongodb.org/browse/JAVA-2429</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;When I execute the command &lt;tt&gt;db.getCollection(&quot;collname&quot;).distinct(&quot;fieldname&quot;);&lt;/tt&gt; on a collection that contains a document like &lt;/p&gt;

&lt;p/&gt;
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&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;
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					&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;Exception in thread &quot;main&quot; java.lang.IllegalArgumentException: The value for key value can not be null&lt;/span&gt;&lt;/pre&gt;
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						&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;	at org.bson.BsonDocument.put(BsonDocument.java:721)&lt;/span&gt;&lt;/pre&gt;
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						&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;	at org.bson.BsonDocument.&amp;lt;init&amp;gt;(BsonDocument.java:83)&lt;/span&gt;&lt;/pre&gt;
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						&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;	at com.mongodb.DBCollection$1.apply(DBCollection.java:1185)&lt;/span&gt;&lt;/pre&gt;
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						&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;	at com.mongodb.DBCollection$1.apply(DBCollection.java:1182)&lt;/span&gt;&lt;/pre&gt;
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		&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;	at com.mongodb.MappingIterable$1.apply(MappingIterable.java:53)&lt;/span&gt;&lt;/pre&gt;
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				&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;	at com.mongodb.OperationIterable.forEach(OperationIterable.java:73)&lt;/span&gt;&lt;/pre&gt;
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				&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;	at com.mongodb.MappingIterable.forEach(MappingIterable.java:50)&lt;/span&gt;&lt;/pre&gt;
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		&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;	at com.mongodb.MappingIterable.into(MappingIterable.java:60)&lt;/span&gt;&lt;/pre&gt;
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				&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;	at com.mongodb.DBCollection.distinct(DBCollection.java:1189)&lt;/span&gt;&lt;/pre&gt;
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				&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;	at com.mongodb.DBCollection.distinct(DBCollection.java:1161)&lt;/span&gt;&lt;/pre&gt;
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				&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;	at com.mongodb.DBCollection.distinct(DBCollection.java:1136)&lt;/span&gt;&lt;/pre&gt;
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				&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;	at com.mongodb.DBCollection.distinct(DBCollection.java:1124)&lt;/span&gt;&lt;/pre&gt;
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						&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;	at DbBugTest.main(DbBugTest.java:13)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

</description>
                <environment></environment>
        <key id="347298">JAVA-2429</key>
            <summary>DBCollection.distinct() fails when a null value is in the result</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="jeff.yemin@mongodb.com">Jeffrey Yemin</assignee>
                                    <reporter username="mango">Jan S.</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Jan 2017 09:28:21 +0000</created>
                <updated>Tue, 24 Jan 2017 18:00:19 +0000</updated>
                            <resolved>Tue, 24 Jan 2017 17:59:50 +0000</resolved>
                                    <version>3.4.0</version>
                                    <fixVersion>3.4.2</fixVersion>
                                    <component>Query Operations</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1484010" author="jeff.yemin" created="Tue, 24 Jan 2017 17:59:44 +0000"  >&lt;p&gt;master:&lt;/p&gt;

&lt;p&gt;commit 8cfd49e4a83866b9b5f01eaf02256057a2e89c26&lt;br/&gt;
Author: Jeff Yemin &amp;lt;jeff.yemin@10gen.com&amp;gt;&lt;br/&gt;
Date:   Tue Jan 24 09:21:05 2017 -0500&lt;/p&gt;

&lt;p&gt;    &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-2429&quot; title=&quot;DBCollection.distinct() fails when a null value is in the result&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-2429&quot;&gt;&lt;del&gt;JAVA-2429&lt;/del&gt;&lt;/a&gt;: Handle null values in DBCollection distinct implementation&lt;/p&gt;</comment>
                            <comment id="1484007" author="jeff.yemin" created="Tue, 24 Jan 2017 17:59:26 +0000"  >&lt;p&gt;3.4.x:&lt;/p&gt;

&lt;p&gt;commit 3b2868465e856681d0096ee3e0d9cc4bd5ac2ccb&lt;br/&gt;
Author: Jeff Yemin &amp;lt;jeff.yemin@10gen.com&amp;gt;&lt;br/&gt;
Date:   Tue Jan 24 09:21:05 2017 -0500&lt;/p&gt;

&lt;p&gt;    &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-2429&quot; title=&quot;DBCollection.distinct() fails when a null value is in the result&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-2429&quot;&gt;&lt;del&gt;JAVA-2429&lt;/del&gt;&lt;/a&gt;: Handle null values in DBCollection distinct implementation&lt;/p&gt;</comment>
                            <comment id="1481115" author="ross@10gen.com" created="Fri, 20 Jan 2017 09:58:42 +0000"  >&lt;p&gt;Thanks the ticket &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mango&quot; class=&quot;user-hover&quot; rel=&quot;mango&quot;&gt;mango&lt;/a&gt; and the test data to reproduce the issue.&lt;/p&gt;

&lt;p&gt;We&apos;ll look into fixing in the next release, in the meantime a work around would be to use the aggregation framework.&lt;/p&gt;</comment>
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