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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-12132] Value::coerceToString() shouldn&apos;t unconditionally construct a stringstream</title>
                <link>https://jira.mongodb.org/browse/SERVER-12132</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It is making $concat much slower than it should be even though the stringstream is never used in that case. Just constructing and destructing it is extremely expensive.&lt;/p&gt;</description>
                <environment></environment>
        <key id="102791">SERVER-12132</key>
            <summary>Value::coerceToString() shouldn&apos;t unconditionally construct a stringstream</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Dec 2013 21:05:31 +0000</created>
                <updated>Mon, 11 Jul 2016 17:38:09 +0000</updated>
                            <resolved>Thu, 19 Dec 2013 00:15:24 +0000</resolved>
                                                    <fixVersion>2.4.10</fixVersion>
                    <fixVersion>2.5.5</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="512128" author="xgen-internal-githook" created="Sun, 9 Mar 2014 15:28:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12132&quot; title=&quot;Value::coerceToString() shouldn&amp;#39;t unconditionally construct a stringstream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12132&quot;&gt;&lt;del&gt;SERVER-12132&lt;/del&gt;&lt;/a&gt; Stop using stringstream in Value::coerceToString()&lt;/p&gt;

&lt;p&gt;This speeds up the function by two changes:&lt;br/&gt;
1) Using StringBuilder (through str::stream) rather than stringstream.&lt;br/&gt;
2) Not constructing a StringBuilder or stringstream when not needed.&lt;/p&gt;

&lt;p&gt;At least with libstdc++, constructing and destructing a stringstream is&lt;br/&gt;
extremely expensive.&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac5d61ca615f5028c32204f69bfd8aca7dbb152b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac5d61ca615f5028c32204f69bfd8aca7dbb152b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="472903" author="xgen-internal-githook" created="Thu, 19 Dec 2013 00:10:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12132&quot; title=&quot;Value::coerceToString() shouldn&amp;#39;t unconditionally construct a stringstream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12132&quot;&gt;&lt;del&gt;SERVER-12132&lt;/del&gt;&lt;/a&gt; Stop using stringstream in Value::coerceToString()&lt;/p&gt;

&lt;p&gt;This speeds up the function by two changes:&lt;br/&gt;
1) Using StringBuilder (through str::stream) rather than stringstream.&lt;br/&gt;
2) Not constructing a StringBuilder or stringstream when not needed.&lt;/p&gt;

&lt;p&gt;At least with libstdc++, constructing and destructing a stringstream is&lt;br/&gt;
extremely expensive.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/edc9da17c4abd325a85134fe5551effe8ee58977&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/edc9da17c4abd325a85134fe5551effe8ee58977&lt;/a&gt;&lt;/p&gt;</comment>
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