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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-11692] Change Variables implementation in agg to not use string lookup at runtime.</title>
                <link>https://jira.mongodb.org/browse/SERVER-11692</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="98400">SERVER-11692</key>
            <summary>Change Variables implementation in agg to not use string lookup at runtime.</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>Thu, 14 Nov 2013 00:13:33 +0000</created>
                <updated>Mon, 11 Jul 2016 17:40:43 +0000</updated>
                            <resolved>Thu, 14 Nov 2013 18:16:49 +0000</resolved>
                                                    <fixVersion>2.5.4</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="455970" author="xgen-internal-githook" created="Thu, 14 Nov 2013 00:49:18 +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-11692&quot; title=&quot;Change Variables implementation in agg to not use string lookup at runtime.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11692&quot;&gt;&lt;del&gt;SERVER-11692&lt;/del&gt;&lt;/a&gt; step 4: Use Variables::Id to get/set Values&lt;/p&gt;

&lt;p&gt;This is what the past 3 commits have been building up to. Variable names are now &quot;compiled away&quot; and&lt;br/&gt;
are not used at run-time.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9f5101d6e90e1da2b76423bf2f066107639ba4e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9f5101d6e90e1da2b76423bf2f066107639ba4e0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="455969" author="xgen-internal-githook" created="Thu, 14 Nov 2013 00:49:17 +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-11692&quot; title=&quot;Change Variables implementation in agg to not use string lookup at runtime.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11692&quot;&gt;&lt;del&gt;SERVER-11692&lt;/del&gt;&lt;/a&gt; step 3: Pass Variables as pointer rather than const ref.&lt;/p&gt;

&lt;p&gt;This is just changing the function signatures and callers, not how Variables is used.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1f9ac013237d1b6ba2fa17769d6dac59e515f373&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1f9ac013237d1b6ba2fa17769d6dac59e515f373&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="455968" author="xgen-internal-githook" created="Thu, 14 Nov 2013 00:49:15 +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-11692&quot; title=&quot;Change Variables implementation in agg to not use string lookup at runtime.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11692&quot;&gt;&lt;del&gt;SERVER-11692&lt;/del&gt;&lt;/a&gt; step 2: use VariablesParseState at parse time&lt;/p&gt;

&lt;p&gt;Now we are assigning Ids but still using names to get/set variables at run time.  The main&lt;br/&gt;
functional change at this point is that we now error at parse time rather than run time if a user&lt;br/&gt;
accesses an undefined variable.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/06cfa88df67067b7e8108b283a604f0e9169d0a3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/06cfa88df67067b7e8108b283a604f0e9169d0a3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="455967" author="xgen-internal-githook" created="Thu, 14 Nov 2013 00:49:13 +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-11692&quot; title=&quot;Change Variables implementation in agg to not use string lookup at runtime.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11692&quot;&gt;&lt;del&gt;SERVER-11692&lt;/del&gt;&lt;/a&gt; step 1: VariablesParseState plumbing&lt;/p&gt;

&lt;p&gt;VariablesParseState isn&apos;t yet used, this just pushes it through the parsing so that it can be used&lt;br/&gt;
in future commits.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/31eba1a06f997491189f3eeade642b02ada85627&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/31eba1a06f997491189f3eeade642b02ada85627&lt;/a&gt;&lt;/p&gt;</comment>
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