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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>[CSHARP-4559] LINQ Provider V3 Has Different Behavior?</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4559</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;&lt;em&gt;Upgrading to LINQ provider 3 caused unexpected behavior in our application. Here&apos;s a query that returns results in v2, but returns nothing on v3:&lt;/em&gt;&#160;&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;query.Where(x =&amp;gt;&#160;&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;    x.ClientName.ToLower().Contains(dto.Client) || &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;    x.ClientEmail.ToLower().Contains(dto.Client)&#160;||&#160; &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;    x.AdditionalClients.Any(c =&amp;gt; &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;        c.ClientName.ToLower().Contains(dto.Client) || &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;        c.ClientEmail.ToLower().Contains(dto.Client)));&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;Has the behavior of Contains changed intentionally?&lt;/p&gt;

&lt;p&gt;Driver: 2.19&lt;/p&gt;

&lt;p&gt;Server: Atlas 5.0.15&lt;/p&gt;</description>
                <environment></environment>
        <key id="2281534">CSHARP-4559</key>
            <summary>LINQ Provider V3 Has Different Behavior?</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</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="13203">Gone away</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="cassio@intakeq.com">Cassio Mosqueira</reporter>
                        <labels>
                            <label>LINQ3</label>
                    </labels>
                <created>Sun, 5 Mar 2023 13:09:36 +0000</created>
                <updated>Fri, 27 Oct 2023 19:55:59 +0000</updated>
                            <resolved>Fri, 7 Apr 2023 12:00:53 +0000</resolved>
                                    <version>2.19.0</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5331976" author="dbeng-pm-bot" created="Fri, 7 Apr 2023 12:00:55 +0000"  >&lt;p&gt;There hasn&apos;t been any recent activity on this ticket, so we&apos;re resolving it. Thanks for reaching out! Please feel free to comment on this if you&apos;re able to provide more information.&lt;/p&gt;</comment>
                            <comment id="5298172" author="dbeng-pm-bot" created="Fri, 24 Mar 2023 12:00:47 +0000"  >&lt;p&gt;Hey &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cassio%40intakeq.com&quot; class=&quot;user-hover&quot; rel=&quot;cassio@intakeq.com&quot;&gt;cassio@intakeq.com&lt;/a&gt;, We need additional details to investigate the problem. If this is still an issue for you, please provide the requested information.&lt;/p&gt;</comment>
                            <comment id="5278255" author="rstam" created="Thu, 16 Mar 2023 16:51:22 +0000"  >&lt;p&gt;I was unable to reproduce this. You can see my attempt to reproduce this here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/rstam/mongo-csharp-driver/blob/csharp4559/tests/MongoDB.Driver.Tests/Linq/Linq3ImplementationTests/Jira/CSharp4559Tests.cs&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/rstam/mongo-csharp-driver/blob/csharp4559/tests/MongoDB.Driver.Tests/Linq/Linq3ImplementationTests/Jira/CSharp4559Tests.cs&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I had to guess at the class declarations to get a full example that would compile and run.&lt;/p&gt;

&lt;p&gt;I found that LINQ2 and LINQ3 produce the &lt;b&gt;exact&lt;/b&gt; same MQL, so therefore they also return the same results.&lt;/p&gt;

&lt;p&gt;Let me know if I have missed something.&lt;/p&gt;</comment>
                            <comment id="5256606" author="rstam" created="Tue, 7 Mar 2023 20:05:27 +0000"  >&lt;p&gt;Thanks for reporting this. I will investigate further before long.&lt;/p&gt;</comment>
                    </comments>
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