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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>[SERVER-27761] view can be created on top of a view with different collation than underlying view</title>
                <link>https://jira.mongodb.org/browse/SERVER-27761</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you create a view with collation on non-existent view and then create that underlying view with different collation, it seems to be allowed which violates &quot;no overriding collation by view on top of another view&quot;.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="347129">SERVER-27761</key>
            <summary>view can be created on top of a view with different collation than underlying view</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Thu, 19 Jan 2017 20:54:39 +0000</created>
                <updated>Tue, 15 Aug 2017 01:18:07 +0000</updated>
                            <resolved>Tue, 4 Apr 2017 17:58:54 +0000</resolved>
                                    <version>3.4.1</version>
                                    <fixVersion>3.4.4</fixVersion>
                    <fixVersion>3.5.6</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1549877" author="xgen-internal-githook" created="Fri, 14 Apr 2017 21:15:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27761&quot; title=&quot;view can be created on top of a view with different collation than underlying view&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27761&quot;&gt;&lt;del&gt;SERVER-27761&lt;/del&gt;&lt;/a&gt; track collation in ViewGraph&lt;/p&gt;

&lt;p&gt;Keeps track of the collation of views in the ViewGraph, to ensure that all views in the same&lt;br/&gt;
connected component share the same collation. This prohibits users from dropping a view and&lt;br/&gt;
recreating it with a different collation if other views depend on it.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 476c7733f5dc01011e1ebd9d7818aad8d63a1781)&lt;/p&gt;

&lt;p&gt; Conflicts:&lt;br/&gt;
	jstests/core/views/views_collation.js&lt;br/&gt;
	src/mongo/db/views/SConscript&lt;br/&gt;
	src/mongo/db/views/view_graph.cpp&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/94c5dff95cbeeb1da7d50738d1ceebe5251f528e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/94c5dff95cbeeb1da7d50738d1ceebe5251f528e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1540632" author="xgen-internal-githook" created="Tue, 4 Apr 2017 17:58:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27761&quot; title=&quot;view can be created on top of a view with different collation than underlying view&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27761&quot;&gt;&lt;del&gt;SERVER-27761&lt;/del&gt;&lt;/a&gt; track collation in ViewGraph&lt;/p&gt;

&lt;p&gt;Keeps track of the collation of views in the ViewGraph, to ensure that all views in the same&lt;br/&gt;
connected component share the same collation. This prohibits users from dropping a view and&lt;br/&gt;
recreating it with a different collation if other views depend on it.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/476c7733f5dc01011e1ebd9d7818aad8d63a1781&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/476c7733f5dc01011e1ebd9d7818aad8d63a1781&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1480703" author="asya" created="Thu, 19 Jan 2017 21:17:15 +0000"  >&lt;p&gt;The same could happen if view is created on top of view with same collation, but then you can drop the underlying view and re-create it with a different collation...&lt;/p&gt;</comment>
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&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;
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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;db.createView(&quot;view2&quot;, &quot;view1&quot;, [], {collation:{locale:&quot;fr&quot;}})&lt;/span&gt;&lt;/pre&gt;
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