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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-66427] Add test case for massive array info</title>
                <link>https://jira.mongodb.org/browse/SERVER-66427</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The columnar format supports having a massive array info, but this path is likely never exercised. We should add a test case for this situation for completeness.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2045332">SERVER-66427</key>
            <summary>Add test case for massive array info</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="9">Done</resolution>
                                        <assignee username="erin.zhu@mongodb.com">Erin Zhu</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 May 2022 22:05:20 +0000</created>
                <updated>Fri, 19 Aug 2022 20:54:31 +0000</updated>
                            <resolved>Fri, 19 Aug 2022 19:59:11 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4764670" author="xgen-internal-githook" created="Fri, 19 Aug 2022 20:54:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Erin Zhu&apos;, &apos;email&apos;: &apos;erin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;erinzhu001&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66427&quot; title=&quot;Add test case for massive array info&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66427&quot;&gt;&lt;del&gt;SERVER-66427&lt;/del&gt;&lt;/a&gt; Create column store index test for larger arrayInfo strings&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bd3a4efde0c07c5760111607d268383a83a6bce4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bd3a4efde0c07c5760111607d268383a83a6bce4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4665032" author="justin.seyster" created="Thu, 7 Jul 2022 23:02:14 +0000"  >&lt;p&gt;Some background for this ticket: the format for how we physically lay out an index entry&apos;s arrayInfo varies slightly depending on the size of the arrayInfo. The layout code illustrates how the layout changes and what the size thresholds are for each possible format.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a49498a6bcbcf2fdabd07612e4d8b3d8a87440b4/src/mongo/db/index/column_cell.cpp#L200-L230&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/a49498a6bcbcf2fdabd07612e4d8b3d8a87440b4/src/mongo/db/index/column_cell.cpp#L200-L230&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Currently, almost none of our testing involves documents that will generate larger arrayInfo strings, which leaves us open to compatibility problems if a change inadvertently modifies the arrayInfo encoding or decoding logic. I suggest a new jstest that creates objects large enough for each of the arrayInfo storage format, inserts them into a collection with a column store index, and then verifies that reads covered by the index produce correct results.&lt;/p&gt;

&lt;p&gt;It&apos;s possible to create an arrayInfo of a desired size using a pattern like this:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &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;  margin-top: 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;{a: [{b: [1, 2]}, {b: [3, 4]}, {b: [5, 6]}, ...]}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;If this example had exactly the three entries  in &lt;tt&gt;a&lt;/tt&gt; (i.e., without the &quot;...&quot;), the array info for the &lt;tt&gt;a.b&lt;/tt&gt; would have length 13:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &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;  margin-top: 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;[{[|1]{[|1]{[&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Every extra sub-document in the &lt;tt&gt;a&lt;/tt&gt; array adds and extra 5 bytes to the &lt;tt&gt;a.b&lt;/tt&gt; arrayInfo.&lt;/p&gt;

&lt;p&gt;In documents with this format, it will always be possible cover queries that project &lt;tt&gt;a.b&lt;/tt&gt; so we can verify that the column scan is correctly reading and decoding the arrayInfo.&lt;/p&gt;</comment>
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