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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-72049] [CQF] Test all plans for a single MQL query</title>
                <link>https://jira.mongodb.org/browse/SERVER-72049</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Let&apos;s try the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Create a new C++ unit test in a new file, with similar dependencies as sbe_abt_test.cpp.&lt;/li&gt;
	&lt;li&gt;Write a single example:
	&lt;ul&gt;
		&lt;li&gt;query in MQL&lt;/li&gt;
		&lt;li&gt;input documents&lt;/li&gt;
		&lt;li&gt;index specs&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Translate the query to ABT&lt;/li&gt;
	&lt;li&gt;Get the query results as naively as possible. For example:
	&lt;ul&gt;
		&lt;li&gt;Disable constant folding&lt;/li&gt;
		&lt;li&gt;Disable exploration rewrites&lt;/li&gt;
		&lt;li&gt;Use a ScanDef with no indexes&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Generate all query plans:
	&lt;ul&gt;
		&lt;li&gt;Leave constant folding, exploration, everything else enabled.&lt;/li&gt;
		&lt;li&gt;Disable branch and bound.&lt;/li&gt;
		&lt;li&gt;Keep rejected plans.&lt;/li&gt;
		&lt;li&gt;Run OptPhaseManager once.&lt;/li&gt;
		&lt;li&gt;Write a new function that extracts all plans from the final memo.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Lower to SBE, and run, each plan.&lt;/li&gt;
	&lt;li&gt;Compare each result to the naive result.
	&lt;ul&gt;
		&lt;li&gt;Use sorting to ignore both field order, and document order.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In other words, this is a property test that holds the query and input data fixed, and asserts: all plans for this query are correct. This means optimization bugs can&apos;t hide behind costing decisions. But we still have control over which examples we test.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This will also be a good opportunity to test cost predictions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2208763">SERVER-72049</key>
            <summary>[CQF] Test all plans for a single MQL query</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="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="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>testing</label>
                    </labels>
                <created>Mon, 12 Dec 2022 19:24:36 +0000</created>
                <updated>Thu, 20 Apr 2023 21:12:48 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5125045" author="david.percy" created="Thu, 19 Jan 2023 19:28:18 +0000"  >&lt;p&gt;If this style of test is too slow we could move it to a task separate from run_unittests: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68063&quot; title=&quot;Ability to define a sub-set of unit tests as a scons target&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68063&quot;&gt;&lt;del&gt;SERVER-68063&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2250994">SERVER-73552</issuekey>
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            <issuekey id="2090482">SERVER-68063</issuekey>
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