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    <title>MongoDB Jira</title>
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    <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-58560] Implement algorithm to determine scale factor</title>
                <link>https://jira.mongodb.org/browse/SERVER-58560</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Scale factor is determined at high level in the BSON type 7 binary. When an encoder is appending doubles that need to compress we will start with scale factor 0 when starting a new Simple-8b block.&lt;/p&gt;

&lt;p&gt;Every double that is appended need their minimal scale factor needed to be able to represent the double exactly as an integer.&#160;&lt;/p&gt;

&lt;p&gt;When a double is appended that needs a larger scale factor than previous doubles the encoder need to determine what can compress the most values between:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Finalize current Simple-8b block and start a new block for the value that needed a larger scale factor.&lt;/li&gt;
	&lt;li&gt;Re-scale previous values to the new (higher) scale factor and check if they still fit within a single Simple-8b block together with the new value.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="1819440">SERVER-58560</key>
            <summary>Implement algorithm to determine scale factor</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Jul 2021 20:53:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:53 +0000</updated>
                            <resolved>Wed, 18 Aug 2021 17:25:07 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4107108" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:17:34 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4004778" author="xgen-internal-githook" created="Tue, 17 Aug 2021 18:01:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58560&quot; title=&quot;Implement algorithm to determine scale factor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58560&quot;&gt;&lt;del&gt;SERVER-58560&lt;/del&gt;&lt;/a&gt; Double support in BSONColumnBuilder&lt;/p&gt;

&lt;p&gt;Doubles are scaled and rounded to closest integer.&lt;br/&gt;
When a double is appended that needs to be scaled differently the encoder validates if flushing simple8b or re-scaling compresses best.&lt;br/&gt;
After writing a finalized simple8b block, the scaling is reduced to be as low as possible.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a64ddda7ade5423803695ef1dc126230bc7458f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a64ddda7ade5423803695ef1dc126230bc7458f9&lt;/a&gt;&lt;/p&gt;</comment>
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