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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-82829] [CQF] Update fallback mechanism to allow sharded aggregations to use CQF</title>
                <link>https://jira.mongodb.org/browse/SERVER-82829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Aggregation commands sent from mongos to shards have let and collation parameters added to them. This causes those queries to fall back to classic, arguably unexpectedly when the original command does not have those fields set. Interestingly, the equivalent find commands do not have those parameters.&lt;/p&gt;

&lt;p&gt;We should update the fallback mechanism to allow queries with simple collations and unused let variables to go through CQF. This will allow sharded aggregations to use CQF.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2491718">SERVER-82829</key>
            <summary>[CQF] Update fallback mechanism to allow sharded aggregations to use CQF</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="hana.pearlman@mongodb.com">Hana Pearlman</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Nov 2023 17:05:20 +0000</created>
                <updated>Thu, 9 Nov 2023 15:19:22 +0000</updated>
                            <resolved>Thu, 9 Nov 2023 15:19:22 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5867912" author="xgen-internal-githook" created="Thu, 9 Nov 2023 15:17:10 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Hana Pearlman&apos;, &apos;email&apos;: &apos;hana.pearlman@mongodb.com&apos;, &apos;username&apos;: &apos;HanaPearlman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82829&quot; title=&quot;[CQF] Update fallback mechanism to allow sharded aggregations to use CQF&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82829&quot;&gt;&lt;del&gt;SERVER-82829&lt;/del&gt;&lt;/a&gt;: Update fallback mechanism to allow sharded aggregations to use CQF&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/74d78d0fe48ba9312902ea9cbd1b6b544abeee0a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/74d78d0fe48ba9312902ea9cbd1b6b544abeee0a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5864477" author="hana.pearlman" created="Wed, 8 Nov 2023 15:47:54 +0000"  >&lt;p&gt;Alrighty, I&apos;m re-purposing this ticket to make those changes. Thanks for the input!&lt;/p&gt;</comment>
                            <comment id="5864464" author="david.storch" created="Wed, 8 Nov 2023 15:44:24 +0000"  >&lt;blockquote&gt;
&lt;p&gt;I&apos;m not sure what work is required to &quot;support&quot; the simple collation other than allowing it in the fallback mechanism.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Agreed, it should just work.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;For let variables, we could ignore the command parameter in the fallback mechanism, and only fall back if we find a variable reference in the query.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Seems reasonable!&lt;/p&gt;</comment>
                            <comment id="5863913" author="hana.pearlman" created="Wed, 8 Nov 2023 13:06:40 +0000"  >&lt;p&gt;Agreed, changing how CQF handles these params sounds simplest.&lt;/p&gt;

&lt;p&gt;I&apos;m not sure what work is required to &quot;support&quot; the simple collation other than allowing it in the fallback mechanism.&#160;&lt;/p&gt;

&lt;p&gt;For let variables, we could ignore the command parameter in the fallback mechanism, and only fall back if we find a variable reference in the query. Or if totally ignoring the parameter seems too extreme, we could special-case NOW and CLUSTER_TIME.&lt;/p&gt;</comment>
                            <comment id="5862669" author="david.storch" created="Wed, 8 Nov 2023 00:01:08 +0000"  >&lt;p&gt;Sounds like we should just make CQF support &lt;tt&gt;collation:{locale:&quot;simple&quot;&lt;/tt&gt;} if it doesn&apos;t already. We may need a separate solution for &quot;$$NOW&quot; and friends.&lt;/p&gt;</comment>
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