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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-55029] Investigate correctness of comparison semantics in SBE</title>
                <link>https://jira.mongodb.org/browse/SERVER-55029</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Aggregation comparison expressions in SBE are implemented using &lt;tt&gt;cmp3w&lt;/tt&gt; VM instruction. This instruction does not have a well defined semantics behind it. It does not implement MQL comparison or WO comparison. This leads to a situation where passing all comparison operators tests is not enough because we do not have any guarantee on the behaviour in some extreme cases (for instance, comparing special values like &lt;tt&gt;NaN&lt;/tt&gt;, &lt;tt&gt;Inf&lt;/tt&gt; and &lt;tt&gt;undefined&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;To fix that, we should:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Strictly define semantics for &lt;tt&gt;cmp3w&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;Ensure that other comparison instructions (&lt;tt&gt;less&lt;/tt&gt;, &lt;tt&gt;eq&lt;/tt&gt;, etc.) have MQL semantics&lt;/li&gt;
	&lt;li&gt;Add an exhaustive test which ensure the behaviour of all find/aggregation comparison operators on various types (including special values)&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="1643164">SERVER-55029</key>
            <summary>Investigate correctness of comparison semantics in SBE</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                            <label>sbe-post-v1</label>
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                <created>Mon, 8 Mar 2021 13:42:15 +0000</created>
                <updated>Tue, 6 Dec 2022 01:32:11 +0000</updated>
                                                                                                <votes>0</votes>
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