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    <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-80730] [CQF] Reduce optimization phases for sampling queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-80730</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are a few optimization phases that can be reduced for sampling queries. For example, ConstEval, PathFuse and MemoExploration. This also allows us to skip rebuilding reference trackers from those phases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2434108">SERVER-80730</key>
            <summary>[CQF] Reduce optimization phases for sampling queries</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="13201">Fixed</resolution>
                                        <assignee username="chii.huang@mongodb.com">Chi-I Huang</assignee>
                                    <reporter username="svilen.mihaylov@mongodb.com">Svilen Mihaylov</reporter>
                        <labels>
                            <label>M1</label>
                            <label>auto-reverted</label>
                    </labels>
                <created>Tue, 5 Sep 2023 14:17:16 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:45 +0000</updated>
                            <resolved>Tue, 26 Sep 2023 17:03:21 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5730012" author="xgen-internal-githook" created="Tue, 26 Sep 2023 00:22:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Chi-I Huang&apos;, &apos;email&apos;: &apos;chii.huang@mongodb.com&apos;, &apos;username&apos;: &apos;chiihuang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80730&quot; title=&quot;[CQF] Reduce optimization phases for sampling queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80730&quot;&gt;&lt;del&gt;SERVER-80730&lt;/del&gt;&lt;/a&gt; Add OptPhase::SamplingConstEval and disable optimization phases for sampling&lt;/p&gt;

&lt;p&gt;SamplingConstEval for now only does beta reduction for LambdaApplication. This allows ABTs to be successfully lowered without going through ConstEvalPost phase.&lt;/p&gt;

&lt;p&gt;Disable ConstEvalPre, PathFuse, ConstEvalPost and MemoExploration for sampling estimator to avoid rebuilding reference tracker.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6eab6b668eacb980d905364353c335b228ae7f16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6eab6b668eacb980d905364353c335b228ae7f16&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5726519" author="xgen-buildbaron-user" created="Sun, 24 Sep 2023 08:05:10 +0000"  >&lt;p&gt;Ticket re-opened due to revert. &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_rhel80_debug_aubsan_classic_engine_display_concurrency_sharded_causal_consistency_and_balancer_63273d321ad6a4671f2e305ceccf1da2d1be5994_23_09_23_01_03_13&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;concurrency_sharded_causal_consistency_and_balancer&lt;/a&gt; began a consistent failure of jstests/concurrency/fsm_workloads/view_catalog_cycle_lookup.js&lt;/p&gt;</comment>
                            <comment id="5726516" author="xgen-internal-githook" created="Sun, 24 Sep 2023 08:03:06 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;auto-revert-processor&apos;, &apos;email&apos;: &apos;dev-prod-dag@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80730&quot; title=&quot;[CQF] Reduce optimization phases for sampling queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80730&quot;&gt;&lt;del&gt;SERVER-80730&lt;/del&gt;&lt;/a&gt; Add OptPhase::SamplingConstEval and disable optimization phases for sampling&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 63273d321ad6a4671f2e305ceccf1da2d1be5994.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/65106a6f95168428eb14f6b09b7ba8954146e409&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/65106a6f95168428eb14f6b09b7ba8954146e409&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5725919" author="xgen-internal-githook" created="Sat, 23 Sep 2023 01:03:21 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Chi-I Huang&apos;, &apos;email&apos;: &apos;chii.huang@mongodb.com&apos;, &apos;username&apos;: &apos;chiihuang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80730&quot; title=&quot;[CQF] Reduce optimization phases for sampling queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80730&quot;&gt;&lt;del&gt;SERVER-80730&lt;/del&gt;&lt;/a&gt; Add OptPhase::SamplingConstEval and disable optimization phases for sampling&lt;/p&gt;

&lt;p&gt;SamplingConstEval for now only does beta reduction for LambdaApplication. This allows ABTs to be successfully lowered without going through ConstEvalPost phase.&lt;/p&gt;

&lt;p&gt;Disable ConstEvalPre, PathFuse, ConstEvalPost and MemoExploration for sampling estimator to avoid rebuilding reference tracker.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/63273d321ad6a4671f2e305ceccf1da2d1be5994&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/63273d321ad6a4671f2e305ceccf1da2d1be5994&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2395597">SERVER-79095</issuekey>
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