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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-5165] investigate lack of type bracketing in shard selection code</title>
                <link>https://jira.mongodb.org/browse/SERVER-5165</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Many indexed queries are bracketed by data type.  For example the index bounds for { a:&lt;/p&gt;
{ $gt:0 }
&lt;p&gt; } are&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;The max value of a we will scan is 1.7976931348623157e+308, not maxKey.  When determining which shards a query should be sent to, though, we do not perform type bracketing.  The queryutil code implements a special mode that disables bracketing just for this case.  It would be helpful to understand why type bracketing is disabled.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    void ChunkManager::getShardsForQuery( set&amp;lt;Shard&amp;gt;&amp;amp; shards , const BSONObj&amp;amp; query ) const {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        OrRangeGenerator org(_ns.c_str(), query, false);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;(The &apos;false&apos; argument disables type bracketing.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="31973">SERVER-5165</key>
            <summary>investigate lack of type bracketing in shard selection code</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Mar 2012 22:40:23 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:05 +0000</updated>
                            <resolved>Fri, 2 May 2014 19:48:30 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="571089" author="siyuan.zhou@10gen.com" created="Fri, 2 May 2014 19:48:30 +0000"  >&lt;p&gt;Fixed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13656&quot; title=&quot;Use new query framework in getShardsForQuery on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13656&quot;&gt;&lt;del&gt;SERVER-13656&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="101510" author="auto" created="Thu, 22 Mar 2012 18:31:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5165&quot; title=&quot;investigate lack of type bracketing in shard selection code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5165&quot;&gt;&lt;del&gt;SERVER-5165&lt;/del&gt;&lt;/a&gt; Fix comment.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8b7859835387ff9d31416caa5916d12d9408a8fb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8b7859835387ff9d31416caa5916d12d9408a8fb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="94782" author="greg_10gen" created="Fri, 2 Mar 2012 21:45:20 +0000"  >&lt;p&gt;I can&apos;t think of a reason that the semantics for determining where to send a query should be different from how that query is actually processed - but I&apos;m not 100% sure how different types compare?&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="27240">SERVER-4555</issuekey>
        </issuelink>
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