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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-62058] SBE for time-series will need $_internalExpr to be more selective</title>
                <link>https://jira.mongodb.org/browse/SERVER-62058</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I don&apos;t believe this is a correctness or performance bug, currently.  I think it will be a performance bug in the future if we enable SBE on time-series collections.&lt;/p&gt;

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

&lt;p&gt;I noticed SBE implements the $_internalExpr operators differently than classic:&lt;/p&gt;

&lt;p/&gt;
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			&lt;/td&gt;
		&lt;/tr&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;   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; : ObjectId(&quot;61aa7b92b996804af1df48c9&quot;) }&lt;/span&gt;&lt;/pre&gt;
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					&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; : ObjectId(&quot;61aa8ebbc9ca709bfcca03e5&quot;), &quot;x&quot; : undefined }&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;{ &quot;_id&quot; : ObjectId(&quot;61aa8efcc9ca709bfcca03e6&quot;), &quot;x&quot; : 6 }&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;   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; : ObjectId(&quot;61aa910b6f5ffffd0b22b2a0&quot;), &quot;x&quot; : 1 }&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;   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; : ObjectId(&quot;61aa910d6f5ffffd0b22b2a1&quot;), &quot;x&quot; : 100 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;&amp;gt; db.c.find({x: {$_internalExprEq: 6}}).explain().queryPlanner.winningPlan.slotBasedPlan.stages&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;[1] filter {true} &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;[1] scan s4 s5 none none none none [] @&quot;25bb7ad1-c1c1-42fa-82cc-80e871af7bcb&quot; true false &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;In the classic engine only {x: 6} would match.&lt;br/&gt;
I noticed because in time-series rewrites, we use these operators to filter down the set of buckets before unpacking.  We&apos;re relying on the specific behaviors documented here: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/93e01aad220ee1ab5ae809acd09426da46e028d0/src/mongo/db/matcher/expression_internal_expr_comparison.h#L36-L53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/93e01aad220ee1ab5ae809acd09426da46e028d0/src/mongo/db/matcher/expression_internal_expr_comparison.h#L36-L53&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I don&apos;t think it&apos;s a problem yet, because it also looks like we don&apos;t generate SBE plans for time-series collections.  But if we do plan to enable SBE+timeseries I think we&apos;ll need to change this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1949384">SERVER-62058</key>
            <summary>SBE for time-series will need $_internalExpr to be more selective</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="parker.felix@mongodb.com">Parker Felix</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>sbe</label>
                    </labels>
                <created>Tue, 14 Dec 2021 20:33:04 +0000</created>
                <updated>Wed, 6 Dec 2023 17:30:51 +0000</updated>
                            <resolved>Tue, 3 Oct 2023 14:14:37 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5747127" author="xgen-internal-githook" created="Tue, 3 Oct 2023 00:32:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Parker Felix&apos;, &apos;email&apos;: &apos;parker.felix@mongodb.com&apos;, &apos;username&apos;: &apos;parker-felix&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62058&quot; title=&quot;SBE for time-series will need $_internalExpr to be more selective&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62058&quot;&gt;&lt;del&gt;SERVER-62058&lt;/del&gt;&lt;/a&gt; Implement $_internalExpr in SBE&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/027de410329bcfd13449bebb6cbee43f8524644c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/027de410329bcfd13449bebb6cbee43f8524644c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5680873" author="JIRAUSER1259274" created="Tue, 5 Sep 2023 18:58:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gil.alon%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;gil.alon@mongodb.com&quot;&gt;gil.alon@mongodb.com&lt;/a&gt;, you&apos;ve been looking at the TS rewrites recently and this ticket is related to them. As Yoonsoo mentioned above, there is an implementation of the internal comp ops in the block processing spike branch: &lt;a href=&quot;https://github.com/10gen/mongo/commit/7dc5f06c51177da7fb4b9fc748b8befd96382cdb#diff-505b6901656a3b7a189eb468f202966c69a3dafd3004fef097dbd4fd3089f449&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/7dc5f06c51177da7fb4b9fc748b8befd96382cdb#diff-505b6901656a3b7a189eb468f202966c69a3dafd3004fef097dbd4fd3089f449&lt;/a&gt; &amp;#8211; we should be able to take it pretty much &quot;as is&quot;. In addition to that we should add a perf workload that relies on the bucket filtering to be done efficiently (I suspect that all TSBS workloads end up using an index so the lack of support of $_internalExpr* in SBE doesn&apos;t affect them)&lt;/p&gt;</comment>
                            <comment id="5680695" author="JIRAUSER1259274" created="Tue, 5 Sep 2023 18:04:51 +0000"  >&lt;p&gt;The ops from the $_internalExpr* family are meant to be non-type-bracketing because they are used to rewrite corresponding non-internal ops used in $expr, which is non-type bracketing. The rewrites of $expr into &quot;plain&quot; $match are done to enable use of indexes. The rewritten terms are prepended to the original match expression with $expr so that we get a more complicated but equivalent filter (with the potential benefit of the non-$expr terms using the indexes). Thus, the trivial implementation of the ops in SBE (the filters always return &quot;true&quot;) doesn&apos;t affect non-TS cases: either the index is used and the internal expression sets the bounds correctly or the index isn&apos;t used in which case the original expression is still applied.&lt;/p&gt;

&lt;p&gt;The TS rewrites are different in the sense that they might replace the original filter with the ones at the bucket level (if the &quot;wholeBucketFilter&quot; is used) or rely on the bucket level filters even in absence of indexes on the corresponding fields. The replacement might produce incorrect results (as the rewritten filters are more permissive), but even if wholeBucketFilter isn&apos;t used, the lack of filtering at the bucket level would be super inefficient.&lt;/p&gt;

&lt;p&gt;Action items:&lt;br/&gt;
1. provide a correct (that is, matching to the classic) implementation of $_internalExpr* ops&lt;br/&gt;
2. consider not using $_internalExpr* for rewrites of non-$expr match&lt;/p&gt;

&lt;p&gt;Note: doing p2 doesn&apos;t remove the necessity of doing p1 because we still want to push to bucket level as many parts of $expr as possible&lt;/p&gt;</comment>
                            <comment id="5310245" author="kyle.suarez" created="Wed, 29 Mar 2023 19:41:33 +0000"  >&lt;p&gt;After discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin@mongodb.com&quot;&gt;james.wahlin@mongodb.com&lt;/a&gt;, adding this to PM-1946.&lt;/p&gt;</comment>
                            <comment id="4262974" author="david.percy" created="Tue, 21 Dec 2021 23:14:14 +0000"  >&lt;p&gt;It looks like PM-2235 is the project that includes enabling SBE on time-series.&lt;/p&gt;</comment>
                            <comment id="4261816" author="JIRAUSER1258718" created="Tue, 21 Dec 2021 15:44:04 +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;, please feel free to move this to a more appropriate epic if you deem fit.&lt;/p&gt;</comment>
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