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    <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-66521] Optimize parseTimeUnit() for date expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-66521</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The parseTimeUnit() is an expensive operation, which is on the hot path for &lt;tt&gt;ExpressionDateDiff&lt;/tt&gt; and &lt;tt&gt;ExpressionDateTrunc&lt;/tt&gt;. In most queries the time unit is specified as a constant in the query. So the &lt;tt&gt;parseTimeUnit()&lt;/tt&gt; can be invoked during the &lt;tt&gt;Expression::optimize()&lt;/tt&gt; and stored as a member variable. Additionally, the &lt;tt&gt;parseTimeUnit()&lt;/tt&gt; does an extra lookup in the &lt;tt&gt;timeUnitNameToTimeUnitMap&lt;/tt&gt; hash map, which can be avoided.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2048570">SERVER-66521</key>
            <summary>Optimize parseTimeUnit() for date expressions</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="13201">Fixed</resolution>
                                        <assignee username="alberto.massari@mongodb.com">Alberto Massari</assignee>
                                    <reporter username="rui.liu@mongodb.com">Rui Liu</reporter>
                        <labels>
                    </labels>
                <created>Tue, 17 May 2022 15:17:22 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:10 +0000</updated>
                            <resolved>Thu, 28 Jul 2022 10:35:51 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4711087" author="xgen-internal-githook" created="Thu, 28 Jul 2022 09:55:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alberto Massari&apos;, &apos;email&apos;: &apos;alberto.massari@mongodb.com&apos;, &apos;username&apos;: &apos;albymassari&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66521&quot; title=&quot;Optimize parseTimeUnit() for date expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66521&quot;&gt;&lt;del&gt;SERVER-66521&lt;/del&gt;&lt;/a&gt; allow partial optimization of expressions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8c46e933d477be2424eb1aa833ec966e761b0205&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8c46e933d477be2424eb1aa833ec966e761b0205&lt;/a&gt;&lt;/p&gt;</comment>
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