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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>[SERVER-30449] ProjectionSpecValidator is O(N**2) in number of fields in the projection</title>
                <link>https://jira.mongodb.org/browse/SERVER-30449</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If it held the _seenPaths in a std::set() rather than a vector, it could check for prefix issues in O(N&amp;#42;logN) time. It may also be possible to use a StringMap to do it in O(N).&lt;/p&gt;</description>
                <environment></environment>
        <key id="410789">SERVER-30449</key>
            <summary>ProjectionSpecValidator is O(N**2) in number of fields in the projection</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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 31 Jul 2017 23:48:21 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:42 +0000</updated>
                            <resolved>Wed, 11 Oct 2017 12:54:38 +0000</resolved>
                                                    <fixVersion>3.4.11</fixVersion>
                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1709767" author="danielgrigg" created="Thu, 26 Oct 2017 06:51:30 +0000"  >&lt;p&gt;Sweet! Thanks for getting this through so quickly!&lt;/p&gt;</comment>
                            <comment id="1709706" author="bernard.gorman" created="Thu, 26 Oct 2017 03:22:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=danielgrigg&quot; class=&quot;user-hover&quot; rel=&quot;danielgrigg&quot;&gt;danielgrigg&lt;/a&gt;, this fix has now been backported to the 3.4 branch. Unfortunately, it narrowly missed the recent release of 3.4.10, but will be available in 3.4.11 (and, of course, in 3.6!)&lt;/p&gt;</comment>
                            <comment id="1709704" author="xgen-internal-githook" created="Thu, 26 Oct 2017 03:18:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30449&quot; title=&quot;ProjectionSpecValidator is O(N**2) in number of fields in the projection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30449&quot;&gt;&lt;del&gt;SERVER-30449&lt;/del&gt;&lt;/a&gt; Reimplement ProjectionSpecValidator::ensurePathDoesNotConflictOrThrow using std::set&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1b740935e30f2e77bd1035194a402a52f0509f28&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1b740935e30f2e77bd1035194a402a52f0509f28&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1695731" author="xgen-internal-githook" created="Wed, 11 Oct 2017 12:49:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30449&quot; title=&quot;ProjectionSpecValidator is O(N**2) in number of fields in the projection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30449&quot;&gt;&lt;del&gt;SERVER-30449&lt;/del&gt;&lt;/a&gt; Reimplement ProjectionSpecValidator::ensurePathDoesNotConflictOrThrow using std::set&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bf805395e5943fe2db2391688b2eb124377e6456&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bf805395e5943fe2db2391688b2eb124377e6456&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1694521" author="david.storch" created="Tue, 10 Oct 2017 14:31:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=danielgrigg&quot; class=&quot;user-hover&quot; rel=&quot;danielgrigg&quot;&gt;danielgrigg&lt;/a&gt;, we definitely plan to evaluate backport to the 3.4 branch once this is pushed to the master branch. Based on the proposed change in code review, a backport looks feasible.&lt;/p&gt;</comment>
                            <comment id="1682829" author="danielgrigg" created="Wed, 27 Sep 2017 06:51:39 +0000"  >&lt;p&gt;Oh man I&apos;m looking forward to this! Are there plans to back port to 3.4 &lt;b&gt;cross fingers&lt;/b&gt; or will we have to wait for 3.6?&lt;/p&gt;</comment>
                            <comment id="1670383" author="bernard.gorman" created="Tue, 12 Sep 2017 14:42:38 +0000"  >&lt;p&gt;Some more representative results, 100 iterations on standalone &lt;tt&gt;mongod&lt;/tt&gt; built with &lt;tt&gt;--opt=on&lt;/tt&gt;:&lt;/p&gt;

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&lt;th class=&apos;confluenceTh&apos;&gt;&lt;tt&gt;master + patch --opt=on&lt;/tt&gt;&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&lt;tt&gt;3.2.16 GA&lt;/tt&gt;&lt;/th&gt;
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</comment>
                            <comment id="1669889" author="david.storch" created="Mon, 11 Sep 2017 21:57:13 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt;, woah! I am now satisfied with the resolution of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30633&quot; title=&quot;Large performance regression for large aggregation queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30633&quot;&gt;&lt;del&gt;SERVER-30633&lt;/del&gt;&lt;/a&gt; as a dup of this ticket. Glad your initial work on this looks promising.&lt;/p&gt;</comment>
                            <comment id="1669854" author="bernard.gorman" created="Mon, 11 Sep 2017 21:28:57 +0000"  >&lt;p&gt;Initial re-implementation with &lt;tt&gt;std::set&lt;/tt&gt; and using the test data supplied by the customer on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30633&quot; title=&quot;Large performance regression for large aggregation queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30633&quot;&gt;&lt;del&gt;SERVER-30633&lt;/del&gt;&lt;/a&gt; reduced the runtime on my laptop from ~17 minutes to... 7 seconds. Note that both runs were on &lt;tt&gt;mongod&lt;/tt&gt; built with &lt;tt&gt;--opt=off&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="1662207" author="charlie.swanson" created="Thu, 31 Aug 2017 21:45:24 +0000"  >&lt;p&gt;Moving to Needs Triage to re-evaluate as a team&lt;/p&gt;</comment>
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