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    <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>[SERVER-43071] toBsonSafeWithDiscriminator mistakenly inverts discriminator byte</title>
                <link>https://jira.mongodb.org/browse/SERVER-43071</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;toBsonSafeWithDiscriminator is a helper function which deserializes a KeyString with discriminator byte back to BSON with discriminator field name.&lt;/p&gt;

&lt;p&gt;The KeyString passed in could have fewer fields than the BSON index key, for example:&lt;br/&gt;
We could have a index key like: {:3, :5, :7}&lt;br/&gt;
Now we want to query {:3, &quot;g&quot;: 5, :7} (&quot;g&quot; means strictly greater than 5 here). The KeyString finally generated would be {:3, &quot;g&quot;: 5} in the KeyString form.&lt;/p&gt;

&lt;p&gt;Now if you try to deserialize it back to the BSON, it will still think it has the third field and tries to invert whatever byte (in this case, discriminator byte) if the Ordering on the third field is -1. And this mistakenly inverts the discriminator byte.&lt;/p&gt;

&lt;p&gt;To fix this function, we could choose not to invert the discriminator byte. There is no easy way to detect how many fields the KeyString has and since this is a helper function only used by EphemeralForTest, it should be fine.&lt;/p&gt;</description>
                <environment></environment>
        <key id="910567">SERVER-43071</key>
            <summary>toBsonSafeWithDiscriminator mistakenly inverts discriminator byte</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="13201">Fixed</resolution>
                                        <assignee username="xiangyu.yao@mongodb.com">Xiangyu Yao</assignee>
                                    <reporter username="xiangyu.yao@mongodb.com">Xiangyu Yao</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Aug 2019 20:17:00 +0000</created>
                <updated>Sun, 29 Oct 2023 22:17:37 +0000</updated>
                            <resolved>Fri, 30 Aug 2019 02:50:17 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2400626" author="xgen-internal-githook" created="Thu, 29 Aug 2019 22:28:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;, &apos;name&apos;: &apos;Xiangyu Yao&apos;, &apos;username&apos;: &apos;xy24&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43071&quot; title=&quot;toBsonSafeWithDiscriminator mistakenly inverts discriminator byte&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43071&quot;&gt;&lt;del&gt;SERVER-43071&lt;/del&gt;&lt;/a&gt; Fix the bug in KeyString::toBsonSafeWithDiscriminator which mistakenly invert discriminator byte&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8ce7a9da5e5c35aab9324a8b2b1b64ad8ca4d608&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8ce7a9da5e5c35aab9324a8b2b1b64ad8ca4d608&lt;/a&gt;&lt;/p&gt;</comment>
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