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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>
    </build-info>


<item>
            <title>[SERVER-59146] Enable push down of $match with $expr </title>
                <link>https://jira.mongodb.org/browse/SERVER-59146</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Similar to MatchExpression splitting in an aggregation pipeline, we want to be able to split an $expr so that we can support use cases including pushdown in front of an unpack bucket stage if it has both meta fields and control fields as arguments. For example, an $expr that looks like&#160;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$expr: {$and: [{$eq: [&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$meta.host&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;host_0&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;]}, {$eq: [&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$a&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;]}]}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;should be split into something like&#160;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$and: [{$expr: {$eq: [&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$meta.host&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;host_0&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;]}, {$expr: {$eq: [&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$a&quot;&lt;/span&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;, &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&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;]}}]}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1842606">SERVER-59146</key>
            <summary>Enable push down of $match with $expr </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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="militsa.sotirova@mongodb.com">Militsa Sotirova</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Aug 2021 18:52:25 +0000</created>
                <updated>Tue, 6 Dec 2022 01:03:14 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4009930" author="bernard.gorman" created="Thu, 19 Aug 2021 15:18:35 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt;: thanks for the heads-up. I&apos;m satisfied to return this to the backlog - we&apos;ve decided to do &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59433&quot; title=&quot;Remove dependency on splitMatchByModifiedFields for change stream rewrites&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59433&quot;&gt;&lt;del&gt;SERVER-59433&lt;/del&gt;&lt;/a&gt; instead, which should give change streams optimization the ability to work around this issue, and ensure that all feasible expressions are pulled forward and rewritten.&lt;/p&gt;</comment>
                            <comment id="4009697" author="charlie.swanson" created="Thu, 19 Aug 2021 14:22:14 +0000"  >&lt;p&gt;Given the uncertainty around this change without a compelling reason to prioritize, I&apos;m putting this on the backlog for now. We don&apos;t believe it to be very easy, but it&apos;s likely not that complex (maybe 1 or 2 weeks?). If you&apos;d like to argue for its priority, please put it back into Needs Scheduling with your pitch!&lt;/p&gt;</comment>
                            <comment id="3998382" author="bernard.gorman" created="Thu, 12 Aug 2021 19:09:03 +0000"  >&lt;p&gt;Although it occurs to me that, since we&apos;re traversing the entire tree and removing predicates where we cannot rewrite them, we could probably get rid of the dependency on &lt;tt&gt;splitMatchByModifiedFields&lt;/tt&gt; completely, and instead simply clone the entire &lt;tt&gt;$match&lt;/tt&gt; and limit our rewrites to the relevant fields by passing a &lt;tt&gt;const std::set&amp;lt;std::string&amp;gt;&amp;amp;&lt;/tt&gt; into &lt;tt&gt;rewriteMatchExpressionTree&lt;/tt&gt; and &lt;tt&gt;rewriteAggExpressionTree&lt;/tt&gt;. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=justin.seyster&quot; class=&quot;user-hover&quot; rel=&quot;justin.seyster&quot;&gt;justin.seyster&lt;/a&gt; what do you think?&lt;/p&gt;</comment>
                            <comment id="3998351" author="bernard.gorman" created="Thu, 12 Aug 2021 18:50:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt;: the concern here is that when doing the rewrites for change streams, which we have &lt;a href=&quot;https://github.com/10gen/mongo/pull/101&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;already completed for &lt;tt&gt;MatchExpression&lt;/tt&gt;&lt;/a&gt; and are &lt;a href=&quot;https://github.com/10gen/mongo/pull/225&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;currently in the process of doing for &lt;tt&gt;$expr&lt;/tt&gt;&lt;/a&gt;, we use &lt;tt&gt;splitMatchByModifiedFields&lt;/tt&gt; and pass it the set of fields that are (1) relevant to the current filter that we&apos;re rewriting, and (2) we know how to perform rewrites for. This works fine in the case of &lt;tt&gt;MatchExpression&lt;/tt&gt;, which can separate out predicates on individual fields. But if there&apos;s an &lt;tt&gt;$expr&lt;/tt&gt; expression, then it&apos;s all-or-nothing; if there are any fields referenced in the &lt;tt&gt;$expr&lt;/tt&gt; that are not present in the set of fields we request, we cannot split them apart.&lt;/p&gt;

&lt;p&gt;Say for example there&apos;s a filter like so:&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;
		&lt;tbody &gt;
				&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;  margin-top: 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;{$expr: {$and: [{$mod: [&quot;$clusterTime&quot;, 3], 0}, {$in: [&quot;$operationType&quot;, [&quot;insert&quot;, &quot;update&quot;]]}]}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;... but we only request expressions on &lt;tt&gt;clusterTime&lt;/tt&gt;. Despite the fact that it would be valid to split this &lt;tt&gt;$expr&lt;/tt&gt; apart and move the &lt;tt&gt;clusterTime&lt;/tt&gt; filter forward, the &lt;tt&gt;$expr&lt;/tt&gt; cannot be split and therefore won&apos;t be pushed down into the oplog filter.&lt;/p&gt;</comment>
                            <comment id="3997351" author="charlie.swanson" created="Thu, 12 Aug 2021 14:18:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt; also points out that this optimization would be useful in the context of some change streams rewrites - can you elaborate on what those are? Is it around predicates involving $tsSeconds which we expect to be popular? &lt;/p&gt;</comment>
                            <comment id="3997349" author="charlie.swanson" created="Thu, 12 Aug 2021 14:17:54 +0000"  >&lt;p&gt;Interesting points &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;! cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=christopher.harris&quot; class=&quot;user-hover&quot; rel=&quot;christopher.harris&quot;&gt;christopher.harris&lt;/a&gt; this came up in some similar recent conversations around SBE and API Versioning. &lt;/p&gt;
</comment>
                            <comment id="3983889" author="david.percy" created="Thu, 5 Aug 2021 19:32:51 +0000"  >&lt;p&gt;This reminds me of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37530&quot; title=&quot;Provide a way to cause a well-defined order of evaluation for predicates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37530&quot;&gt;SERVER-37530&lt;/a&gt;.  We don&apos;t (intend to) guarantee that $and short-circuits, but people may assume this kind of idiom is valid:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.stuff.find({$expr: {$and: [ {$isNumber: &quot;$x&quot;}, {$eq: [0, {$add: [&quot;$x&quot;, 1]}]} ]}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;If $and doesn&apos;t short-circuit, then the $isNumber check doesn&apos;t prevent $add from erroring on non-number inputs.&lt;/p&gt;

&lt;p&gt;ExpressionAnd::evaluate() does just happen to short circuit, so rewriting it to MatchExpression::AND could make the problem reveal itself more often.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="616200">SERVER-37530</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1801220">SERVER-58134</issuekey>
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            <issuekey id="1801220">SERVER-58134</issuekey>
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