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<item>
            <title>[SERVER-4445] aggregation:  use a string table to reduce field name storage when using aggregation</title>
                <link>https://jira.mongodb.org/browse/SERVER-4445</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As an optimization, we can reduce the amount of allocated memory used by sharing the field name strings across all documents re-ified at the beginning of the aggregation pipeline.  The string table can be put into the nascent ExpressionContext (we need to make sure that&apos;s available everywhere necessary).  Every time we reify a document, use the strings in the string table, or add any missing ones.&lt;/p&gt;</description>
                <environment></environment>
        <key id="26129">SERVER-4445</key>
            <summary>aggregation:  use a string table to reduce field name storage when using aggregation</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Dec 2011 00:53:08 +0000</created>
                <updated>Fri, 8 Mar 2013 15:55:53 +0000</updated>
                            <resolved>Tue, 27 Nov 2012 17:29:36 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="200315" author="redbeard0531" created="Tue, 27 Nov 2012 17:29:36 +0000"  >&lt;p&gt;Went in a different direction&lt;/p&gt;</comment>
                            <comment id="99752" author="cwestin" created="Fri, 16 Mar 2012 21:39:19 +0000"  >&lt;p&gt;This should fall out of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4644&quot; title=&quot;aggregation:  optimize memory utilitzation by selective reification of documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4644&quot;&gt;&lt;del&gt;SERVER-4644&lt;/del&gt;&lt;/a&gt; for free.  The table of references there will provide the necessary strings that will be fed to Value::createDocument() in order to determine which fields to copy.&lt;/p&gt;</comment>
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