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    <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-84390] Fix timeseries_predicates.js to actually test what it purports to be testing</title>
                <link>https://jira.mongodb.org/browse/SERVER-84390</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In attempt to cover various data distributions across buckets in a time-series collection the test driver automatically generates 2^N cases for each case of input documents and uses a non-time-series collection as an oracle to check the results.&lt;/p&gt;

&lt;p&gt;1. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71800&quot; title=&quot;Speed up timeseries_predicates.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71800&quot;&gt;&lt;del&gt;SERVER-71800&lt;/del&gt;&lt;/a&gt; made the test somewhat faster (it now takes ~3min in my local runs) but the change wasn&apos;t ported to prior releases. Sometimes (BF-30944) it times out.&lt;br/&gt;
2. Per the change for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73697&quot; title=&quot;Do not split out match expression on meta field when it&amp;#39;s not renameable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73697&quot;&gt;&lt;del&gt;SERVER-73697&lt;/del&gt;&lt;/a&gt; the test was modified in such a way that, while still running through 2^N variations per input, it stopped distributing the inputs across different buckets.&lt;br/&gt;
3. Starting from 5.2 the mixed-type buckets aren&apos;t created so we need a failpoint or some other way to force heterogeneous buckets to test that filtering of upgraded time-series is still correct.&lt;/p&gt;

&lt;p&gt;In post 5.2 there is no failpoint to create mixed-schema buckets by inserting into the user-facing time-series view. However, we can write directly into the system buckets collection. On the storage side this should set timeseriesBucketsMayHaveMixedSchemaData flag (after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84531&quot; title=&quot;Inserting mixed-schema buckets through the system.buckets collection doesn&amp;#39;t set the timeseriesBucketsMayHaveMixedSchemaData flag&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84531&quot;&gt;SERVER-84531&lt;/a&gt; is fixed).&lt;/p&gt;

&lt;p&gt;It also looks like the tests in this file have been extended to cover scenarios that are unrelated to mixed-schema bucketing (e.g. for &lt;br/&gt;
&lt;p/&gt;
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&lt;p/&gt;).&lt;br/&gt;
These tests should probably find a new home.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2531023">SERVER-84390</key>
            <summary>Fix timeseries_predicates.js to actually test what it purports to be testing</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="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-integration">Backlog - Query Integration</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Dec 2023 20:11:59 +0000</created>
                <updated>Thu, 18 Jan 2024 19:34:42 +0000</updated>
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