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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>[CSHARP-4566] Matching on char? throws an ExpressionNotSupportedException</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4566</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;Please provide a clear and concise description of the bug.&lt;/em&gt;&lt;br/&gt;
Attempting to query on a field of type &lt;tt&gt;char?&lt;/tt&gt; causes the driver to crash.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Pleaseprovidetheversionofthedriver.Ifapplicable%2CpleaseprovidetheMongoDBserverversionandtopology%28standalone%2Creplicaset%2Corshardedcluster%29.&quot;&gt;&lt;/a&gt;Please provide the version of the driver. If applicable, please provide the MongoDB server version and topology (standalone, replica set, or sharded cluster).&lt;/h4&gt;
&lt;p&gt;This is a regression in version 2.19.  The same code runs fine without any problem in version 2.18.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;HowtoReproduce&quot;&gt;&lt;/a&gt;How to Reproduce&lt;/h4&gt;
&lt;p&gt;&lt;em&gt;Steps to reproduce. If possible, please include a &lt;a href=&quot;http://sscce.org/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Short, Self Contained, Correct (Compilable), Example&lt;/a&gt;.&lt;/em&gt;&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;
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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;using MongoDB.Driver;&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;MongoClient client = new MongoClient(&quot;mongodb://localhost:27017&quot;);&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;IMongoDatabase db = client.GetDatabase(&quot;test&quot;);&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;IMongoCollection&amp;lt;TestObject&amp;gt; coll = db.GetCollection&amp;lt;TestObject&amp;gt;(&quot;foo&quot;);&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;coll.Find(x =&amp;gt; x.Prop == &apos;a&apos;).ToList();&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;public class TestObject&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;{&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;    public char? Prop { get; set; }&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;   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;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;h4&gt;&lt;a name=&quot;AdditionalBackground&quot;&gt;&lt;/a&gt;Additional Background&lt;/h4&gt;
&lt;p&gt;&lt;em&gt;Please provide any additional background information that may be helpful in diagnosing the bug.&lt;/em&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2286346">CSHARP-4566</key>
            <summary>Matching on char? throws an ExpressionNotSupportedException</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="3" iconUrl="https://jira.mongodb.org/images/icons/statuses/inprogress.png" description="This issue is being actively worked on at the moment by the assignee.">In Progress</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="david.golub@mongodb.com">David Golub</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Mar 2023 01:17:35 +0000</created>
                <updated>Mon, 8 Jan 2024 11:02:55 +0000</updated>
                                            <version>2.19.0</version>
                                                    <component>LINQ3</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5993314" author="JIRAUSER1272042" created="Mon, 8 Jan 2024 11:02:55 +0000"  >&lt;p&gt;Hi, can we please get an update on this? We&apos;ve been stuck on v2.19 for months now and we&apos;d really like to make use of some of the new features.&lt;/p&gt;</comment>
                            <comment id="5760645" author="rstam" created="Fri, 6 Oct 2023 21:54:51 +0000"  >&lt;p&gt;Reopening because some remaining issues were discovered.&lt;/p&gt;</comment>
                            <comment id="5760643" author="xgen-internal-githook" created="Fri, 6 Oct 2023 21:54:06 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;rstam&apos;, &apos;email&apos;: &apos;robert@robertstam.org&apos;, &apos;username&apos;: &apos;rstam&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4566&quot; title=&quot;Matching on char? throws an ExpressionNotSupportedException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4566&quot;&gt;CSHARP-4566&lt;/a&gt;: Support widening numeric and nullable-numeric conversions.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit e9d6231802f165952731bb1aeb7b531b8edaeb26.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/ca09e64a91941c241b36bb85fcd5a9e9be8c2c5b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/ca09e64a91941c241b36bb85fcd5a9e9be8c2c5b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5757655" author="xgen-internal-githook" created="Fri, 6 Oct 2023 00:45:14 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;rstam&apos;, &apos;email&apos;: &apos;robert@robertstam.org&apos;, &apos;username&apos;: &apos;rstam&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4566&quot; title=&quot;Matching on char? throws an ExpressionNotSupportedException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4566&quot;&gt;CSHARP-4566&lt;/a&gt;: Support widening numeric and nullable-numeric conversions.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/e9d6231802f165952731bb1aeb7b531b8edaeb26&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/e9d6231802f165952731bb1aeb7b531b8edaeb26&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5657646" author="JIRAUSER1274449" created="Thu, 24 Aug 2023 20:06:11 +0000"  >&lt;p&gt;Adding our team as dependent on a fix for this, I am quite confident that we have a comparison like this somewhere, seems to be a problem for any binary expression where right side converts to left but not the inverse.&lt;/p&gt;</comment>
                            <comment id="5640783" author="rstam" created="Thu, 17 Aug 2023 15:41:34 +0000"  >&lt;p&gt;Thanks for checking in. We had taken an initial look at this and made some initial progress but ended up prioritizing other fixes before this one. I will take another look.&lt;/p&gt;</comment>
                            <comment id="5635446" author="david.golub" created="Tue, 15 Aug 2023 16:46:19 +0000"  >&lt;p&gt;Just wondering what the status of this ticket is.  It looks like it hasn&apos;t been touched in a couple of months, despite being a regression.&lt;/p&gt;</comment>
                            <comment id="5460699" author="JIRAUSER1264154" created="Tue, 30 May 2023 15:31:11 +0000"  >&lt;p&gt;I have a similar case on 2.19.2 with no relation to &lt;tt&gt;int&lt;/tt&gt;. It happens when comparing a &lt;tt&gt;long?&lt;/tt&gt; to a &lt;tt&gt;double&lt;/tt&gt;:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;Expression not supported: Convert(hamster.Weight, Nullable`1) because conversion to System.Nullable`1&lt;span class=&quot;error&quot;&gt;&amp;#91;System.Double&amp;#93;&lt;/span&gt; is not supported&lt;/tt&gt;&lt;/p&gt;</comment>
                            <comment id="5268113" author="james.kovacs" created="Mon, 13 Mar 2023 16:14:41 +0000"  >&lt;p&gt;When writing tests, check &lt;tt&gt;char&lt;/tt&gt; and other types smaller than int32 plus their nullable variants.&lt;/p&gt;</comment>
                            <comment id="5267859" author="rstam" created="Mon, 13 Mar 2023 15:16:30 +0000"  >&lt;p&gt;Thanks for reporting this. I am able to reproduce this. The exception thrown is:&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;
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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-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;MongoDB.Driver.Linq.ExpressionNotSupportedException : Expression not supported: Convert(x.Prop, Nullable`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;) because conversion to System.Nullable`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;[System.Int32] is not supported.&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
                    </comments>
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                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="2305862">CSHARP-4596</issuekey>
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