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            <title>[SERVER-27235] Improve performance of QueryPlannerIXSelect::getFields()</title>
                <link>https://jira.mongodb.org/browse/SERVER-27235</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;QueryPlannerIXSelect::getFields() performs expensive string creation and concatenation operations. This can be avoided for queries that don&apos;t involve $elemMatch as the string returned is the same as stored in the MatchExpression. &lt;/p&gt;

&lt;p&gt;Identified as a hotspot by running the Queries.RegexPrefixFindOne mongo-perf test (in read command mode) under VTune.&lt;/p&gt;</description>
                <environment></environment>
        <key id="335288">SERVER-27235</key>
            <summary>Improve performance of QueryPlannerIXSelect::getFields()</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
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                <created>Wed, 30 Nov 2016 20:46:54 +0000</created>
                <updated>Wed, 5 Apr 2017 16:44:13 +0000</updated>
                            <resolved>Tue, 20 Dec 2016 21:20:58 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1462538" author="james.wahlin@10gen.com" created="Tue, 20 Dec 2016 21:20:58 +0000"  >&lt;p&gt;Work to reduce getFields() CPU consumption has had a negligible impact on the micro-benchmarks we were targeting and appears to cause a small loss of performance for others. Given this was not one of the more significant hotspots found we are closing and will focus efforts elsewhere.&lt;/p&gt;</comment>
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