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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-46689] $bucketAuto should optimize its expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-46689</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45447&quot; title=&quot;Implement $accumulator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45447&quot;&gt;&lt;del&gt;SERVER-45447&lt;/del&gt;&lt;/a&gt; we found that $bucketAuto does not override the optimize() method, which means expressions inside a $bucketAuto were not being constant-folded.&#160; We&apos;ve fixed this in 4.4.&lt;/p&gt;

&lt;p&gt;This has caused us to lose some test coverage, because queries using $bucketAuto in 4.2 vs 4.4 can return different results.&#160; A lot of the cases involve one query erroring and the other not, but some cases may involve two slightly different results.&lt;/p&gt;

&lt;p&gt;Giving $bucketAuto an optimize() method on 4.2 would be a small code change, would make some queries faster, and would make our 4.4 tests greener.&#160; But it could also cause subtle behavior changes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1241351">SERVER-46689</key>
            <summary>$bucketAuto should optimize its expressions</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Fri, 6 Mar 2020 20:09:11 +0000</created>
                <updated>Tue, 6 Dec 2022 02:33:47 +0000</updated>
                            <resolved>Tue, 19 May 2020 12:48:50 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2979113" author="david.percy" created="Fri, 13 Mar 2020 17:43:01 +0000"  >&lt;p&gt;optimize(), as currently implemented, can change the results of a query, because some operators like $add and $multiply are marked as associative even though they are not associative.&lt;/p&gt;

&lt;p&gt;$add is not associative because floating point addition is not associative.&#160; An expression like &lt;tt&gt;1 + 1e99 + -1e99&lt;/tt&gt;&#160;is parsed as &lt;tt&gt;d((1 + 1e99) + -1e99&lt;/tt&gt;, and evaluates to 0 because of rounding error.  Re-associating it to &lt;tt&gt;1 + (1e99 + -1e99)&lt;/tt&gt; removes the rounding error, and changes the result to 1.&lt;/p&gt;

&lt;p&gt;When optimize() sees an $add, it reorders the arguments to put the constant arguments together, so it can constant-fold them.  You can observe this by changing a constant to a variable using $let:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;   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;{ &quot;_id&quot; : 0 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   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;&amp;gt; db.coll.aggregate([ {$project: {_id: {$let: {vars: {one: 1.0}, in: {$add: [&quot;$$one&quot;, 1e99, -1e99]}}} }} ])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&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;{ &quot;_id&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;In the first example, the $add gets optimized to {{ {$const: 0} }} because all its arguments are constant, but in the second example, it gets optimized to {{ {$add: &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;$$one&amp;quot;, 0&amp;#93;&lt;/span&gt;} }}.&lt;/p&gt;</comment>
                            <comment id="2978596" author="david.storch" created="Fri, 13 Mar 2020 14:50:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.percy&quot; class=&quot;user-hover&quot; rel=&quot;david.percy&quot;&gt;david.percy&lt;/a&gt; it makes sense to me that this difference between 4.2 and 4.4 could cause one query erroring and the other not in the agg multiversion fuzzer. But how can it cause two slightly different results? If the result sets are indeed different, then it seems like there is a bug in the server. Alternatively, perhaps the result sets should be considered equal by the logic in the fuzzer?&lt;/p&gt;</comment>
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