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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-31760] Lookup sub-pipeline is not using index for equality match</title>
                <link>https://jira.mongodb.org/browse/SERVER-31760</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am doing following aggregation to join two collection using foreign pipeline.&lt;br/&gt;
It seems match stage is not using index at all.&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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.blogpost.aggregate([&lt;/span&gt;&lt;/pre&gt;
			&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;  { $lookup: { &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    from: &apos;comment&apos;, &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    let: { blogpost_id: &quot;$_id&quot; }, &lt;/span&gt;&lt;/pre&gt;
			&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;    pipeline: [ { &lt;/span&gt;&lt;/pre&gt;
			&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;       $match: { $expr: { $eq: [ &quot;$blogpost.id&quot;, &quot;$$blogpost_id&quot;] } } &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&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;    as: &apos;comments&apos;&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;  }}&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;   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;])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment>MongoDB server version: 3.6.0-rc1</environment>
        <key id="452431">SERVER-31760</key>
            <summary>Lookup sub-pipeline is not using index for equality match</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="naveenk">Naveen</reporter>
                        <labels>
                    </labels>
                <created>Sun, 29 Oct 2017 06:38:46 +0000</created>
                <updated>Thu, 23 Aug 2018 04:38:39 +0000</updated>
                            <resolved>Thu, 4 Jan 2018 18:37:59 +0000</resolved>
                                                    <fixVersion>3.6.3</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>4</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="1983400" author="twilson" created="Thu, 23 Aug 2018 04:38:39 +0000"  >&lt;p&gt;I&apos;ve found that $expr still does not use the correct index if it is a multi-key index. I&apos;ve created a ticket here:&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36818&quot; title=&quot;$expr does not use multi-key index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36818&quot;&gt;&lt;del&gt;SERVER-36818&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1864499" author="asya" created="Sun, 15 Apr 2018 03:27:09 +0000"  >&lt;p&gt;Since this bug was fixed, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aniket&quot; class=&quot;user-hover&quot; rel=&quot;aniket&quot;&gt;aniket&lt;/a&gt; please open a new SERVER ticket indicating behavior which appears to be wrong.  Please provide all information (exact aggregation, available indexes, relevant log lines).&lt;/p&gt;</comment>
                            <comment id="1864375" author="aniket" created="Sat, 14 Apr 2018 07:18:16 +0000"  >&lt;p&gt;I am still facing same issue with current stable vaersion 3.6.3.&lt;/p&gt;</comment>
                            <comment id="1792227" author="xgen-internal-githook" created="Thu, 1 Feb 2018 19:22:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31760&quot; title=&quot;Lookup sub-pipeline is not using index for equality match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31760&quot;&gt;&lt;del&gt;SERVER-31760&lt;/del&gt;&lt;/a&gt; Optimize $expr to allow index use for equality predicates.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9282f7813d97756f0ab1e635d57e84b7145560d7)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
       src/mongo/db/matcher/rewrite_expr.cpp&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6a67111af31e1352c43a821e10b7409e43205863&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6a67111af31e1352c43a821e10b7409e43205863&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1792226" author="xgen-internal-githook" created="Thu, 1 Feb 2018 19:22:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31760&quot; title=&quot;Lookup sub-pipeline is not using index for equality match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31760&quot;&gt;&lt;del&gt;SERVER-31760&lt;/del&gt;&lt;/a&gt; Add index support for InternalExprEqMatchExpression.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6699621bfb54174c7ee082ee85c62211788942c3)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
       src/mongo/db/matcher/expression_internal_expr_eq.cpp&lt;br/&gt;
       src/mongo/db/matcher/expression_internal_expr_eq.h&lt;br/&gt;
       src/mongo/db/matcher/expression_internal_expr_eq_test.cpp&lt;br/&gt;
       src/mongo/db/matcher/expression_leaf.cpp&lt;br/&gt;
       src/mongo/db/matcher/expression_leaf.h&lt;br/&gt;
       src/mongo/db/matcher/expression_parser.cpp&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/779beeca39066f939dc4fdbcb05f2e6ed05e99fa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/779beeca39066f939dc4fdbcb05f2e6ed05e99fa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1792225" author="xgen-internal-githook" created="Thu, 1 Feb 2018 19:22:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31760&quot; title=&quot;Lookup sub-pipeline is not using index for equality match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31760&quot;&gt;&lt;del&gt;SERVER-31760&lt;/del&gt;&lt;/a&gt; Add InternalExprEqMatchExpression.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 01c39d416435f930d249701ccb71744b519873b5)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
       src/mongo/db/matcher/expression_array.h&lt;br/&gt;
       src/mongo/db/matcher/expression_leaf.h&lt;br/&gt;
       src/mongo/db/matcher/expression_path.h&lt;br/&gt;
       src/mongo/db/matcher/expression_type.h&lt;br/&gt;
       src/mongo/db/matcher/path.cpp&lt;br/&gt;
       src/mongo/db/matcher/path_test.cpp&lt;br/&gt;
       src/mongo/db/matcher/schema/expression_internal_schema_eq.cpp&lt;br/&gt;
       src/mongo/db/matcher/schema/expression_internal_schema_object_match.cpp&lt;br/&gt;
       src/mongo/s/shard_key_pattern.cpp&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/72267ebfbe177cb37f742397f633bc484ebf52c5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/72267ebfbe177cb37f742397f633bc484ebf52c5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1765276" author="xgen-internal-githook" created="Thu, 4 Jan 2018 18:35:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31760&quot; title=&quot;Lookup sub-pipeline is not using index for equality match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31760&quot;&gt;&lt;del&gt;SERVER-31760&lt;/del&gt;&lt;/a&gt; Optimize $expr to allow index use for equality predicates.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9282f7813d97756f0ab1e635d57e84b7145560d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9282f7813d97756f0ab1e635d57e84b7145560d7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1761603" author="xgen-internal-githook" created="Fri, 29 Dec 2017 18:22:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31760&quot; title=&quot;Lookup sub-pipeline is not using index for equality match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31760&quot;&gt;&lt;del&gt;SERVER-31760&lt;/del&gt;&lt;/a&gt; Add index support for InternalExprEqMatchExpression.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6699621bfb54174c7ee082ee85c62211788942c3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6699621bfb54174c7ee082ee85c62211788942c3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1755220" author="xgen-internal-githook" created="Mon, 18 Dec 2017 23:45:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31760&quot; title=&quot;Lookup sub-pipeline is not using index for equality match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31760&quot;&gt;&lt;del&gt;SERVER-31760&lt;/del&gt;&lt;/a&gt; Add InternalExprEqMatchExpression.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/01c39d416435f930d249701ccb71744b519873b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/01c39d416435f930d249701ccb71744b519873b5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1736008" author="james.wahlin@10gen.com" created="Tue, 28 Nov 2017 15:05:40 +0000"  >&lt;p&gt;Hi Naveen,&lt;/p&gt;

&lt;p&gt;We are working on fixing this issue on our development branch (which is what &quot;3.7 Desired&quot; reflects). Once a fix is in place we will evaluate for backport to the 3.6 stable branch, which if green-lighted would be delivered in one of the 3.6 minor releases. Please continue to watch this ticket for updates.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
James&lt;/p&gt;</comment>
                            <comment id="1735805" author="naveenk" created="Tue, 28 Nov 2017 08:29:39 +0000"  >&lt;p&gt;Thanks James! Will the fix be available in 3.6? What is &quot;3.7 Desired&quot;?&lt;/p&gt;</comment>
                            <comment id="1717599" author="james.wahlin@10gen.com" created="Mon, 6 Nov 2017 15:27:56 +0000"  >&lt;p&gt;Hi Naveen,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this issue. My apologies for the silence on this ticket. &lt;/p&gt;

&lt;p&gt;It is expected that $lookup with a foreign pipeline, which references a foreign dotted field path, will not use indexes in mongod version 3.6.0-rc1. This is the case when using &lt;tt&gt;$expr&lt;/tt&gt; in a find command against a single collection as well. We recognize that this behavior is not ideal and are exploring the addition of index use for equality for 3.6.0, at least for the case where the foreign field is not of type array. We will use this ticket to track and will update when we have more information.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
James&lt;/p&gt;</comment>
                    </comments>
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