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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CSHARP-4956] ExpressionNotSupported Exception after updating to 2.19</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4956</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description></description>
                <environment></environment>
        <key id="2568031">CSHARP-4956</key>
            <summary>ExpressionNotSupported Exception after updating to 2.19</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="3">Duplicate</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="ilya.chernomordik@scaleaq.com">Ilya Chernomordik</reporter>
                        <labels>
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                <created>Tue, 6 Feb 2024 08:15:58 +0000</created>
                <updated>Wed, 7 Feb 2024 09:46:35 +0000</updated>
                            <resolved>Tue, 6 Feb 2024 17:33:57 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="6074319" author="JIRAUSER1277109" created="Wed, 7 Feb 2024 09:46:35 +0000"  >&lt;p&gt;I have checked the suggested solution and it would not quite work for me. The reason I had the projection is that the data is quite large and querying it all would be very inefficient. So what I really need is kind of a &quot;path&quot; to the data that I would like to query and a return type that this &quot;path&quot; should be converted to.&#160;&lt;/p&gt;

&lt;p&gt;It does work like that for filter/update queries (though there is no casting to a type of a response), but I did not find any way to do it for find. Is there some workaround for that? I do not really need any &quot;projection&quot; like a function call, but just specifying a &quot;path&quot; that happens to be specified using polymorphism hence the need for &quot;projection&quot;.&lt;/p&gt;</comment>
                            <comment id="6074130" author="JIRAUSER1277109" created="Wed, 7 Feb 2024 08:06:36 +0000"  >&lt;p&gt;Thank you, I will take a look. May I suggest to do a major update of the package (in semver sense) since it was not very clear what has broken and why (and especially in which version) since it was really just a minor update.&lt;/p&gt;</comment>
                            <comment id="6072242" author="rstam" created="Tue, 6 Feb 2024 17:33:12 +0000"  >&lt;p&gt;The behavior of client side projections changed in LINQ3. This was a deliberate choice we made, although we are considering supporting client side projections in LINQ3 also.&lt;/p&gt;

&lt;p&gt;In the meantime, please look at the technique suggested in &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4763&quot; title=&quot;Consider supporting client side projections with Find in LINQ3&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4763&quot;&gt;CSHARP-4763&lt;/a&gt; on how to do explicit client side projections when using LINQ3.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="6070447" author="JIRAUSER1277109" created="Tue, 6 Feb 2024 08:21:07 +0000"  >&lt;p&gt;I did not manage to create a description somehow, so I will just post a reference to a forum post that I have created earlier&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://www.mongodb.com/community/forums/t/expressionnotsupported-exception-after-updating-to-2-19/263364&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/community/forums/t/expressionnotsupported-exception-after-updating-to-2-19/263364&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/510058/510058_image-2024-02-06-09-22-27-124.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="6070443" author="dbeng-pm-bot" created="Tue, 6 Feb 2024 08:16:01 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ilya.chernomordik%40scaleaq.com&quot; class=&quot;user-hover&quot; rel=&quot;ilya.chernomordik@scaleaq.com&quot;&gt;ilya.chernomordik@scaleaq.com&lt;/a&gt;, thank you for reporting this issue! The team will look into it and get back to you soon. &lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
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            <issuekey id="2421183">CSHARP-4763</issuekey>
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                            <attachment id="510058" name="image-2024-02-06-09-22-27-124.png" size="291741" author="ilya.chernomordik@scaleaq.com" created="Tue, 6 Feb 2024 08:22:28 +0000"/>
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