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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-13661] Increase the maximum allowed depth of query objects</title>
                <link>https://jira.mongodb.org/browse/SERVER-13661</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of April 21, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
The limit for the recursive tree depth of query documents currently is only 10 levels deep. While most queries should not be affected by this issue, certain auto-generated queries, for example from ORM mappers, can construct complex nested query documents and hit the limit.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
In 2.4 the limit was not strictly enforced, so users may find some of their queries to be rejected after upgrading to 2.6. &lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
Manual queries with a high tree depth often can be reduced to a flatter version, for example by removing nested &lt;tt&gt;$and&lt;/tt&gt; predicates and instead adding the conditions to a single &lt;tt&gt;$and&lt;/tt&gt; statement.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION&lt;/b&gt;&lt;br/&gt;
This patch increases the tree depth from 10 to 100 and brings it in line with the value documented on the &lt;a href=&quot;http://docs.mongodb.org/manual/reference/limits/#Nested-Depth-for-BSON-Documents&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB Limits and Thresholds&lt;/a&gt; page.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
MongoDB 2.6.0 is affected by this bug.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
The patch is included in the 2.6.1 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;Right now the number of recursive calls is limited to 20 in parsing (which corresponds to a maximum allowed tree depth of 10):&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/019c401589b34b46bf7bec801e23bd3dd7796151/src/mongo/db/matcher/expression_parser_tree.cpp#L46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/019c401589b34b46bf7bec801e23bd3dd7796151/src/mongo/db/matcher/expression_parser_tree.cpp#L46&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Some autogenerated queries may hit this limit, so let&apos;s make it higher.&lt;/p&gt;</description>
                <environment></environment>
        <key id="132182">SERVER-13661</key>
            <summary>Increase the maximum allowed depth of query objects</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Apr 2014 21:36:27 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:08 +0000</updated>
                            <resolved>Mon, 21 Apr 2014 14:51:46 +0000</resolved>
                                    <version>2.6.0</version>
                                    <fixVersion>2.6.1</fixVersion>
                    <fixVersion>2.7.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="557708" author="xgen-internal-githook" created="Mon, 21 Apr 2014 18:00:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13661&quot; title=&quot;Increase the maximum allowed depth of query objects&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13661&quot;&gt;&lt;del&gt;SERVER-13661&lt;/del&gt;&lt;/a&gt; increase the maximum allowed depth for query objects&lt;br/&gt;
(cherry picked from commit a4fc6b326793de8aaa1301c1c7f20ef71e2d03ea)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/66da6ee14e6de327285f76ae73e48a56788ab901&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/66da6ee14e6de327285f76ae73e48a56788ab901&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="557434" author="xgen-internal-githook" created="Mon, 21 Apr 2014 14:50:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13661&quot; title=&quot;Increase the maximum allowed depth of query objects&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13661&quot;&gt;&lt;del&gt;SERVER-13661&lt;/del&gt;&lt;/a&gt; increase the maximum allowed depth for query objects&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a4fc6b326793de8aaa1301c1c7f20ef71e2d03ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a4fc6b326793de8aaa1301c1c7f20ef71e2d03ea&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="162510">SERVER-15559</issuekey>
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