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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-6197] $avg is calculated using integer math for integers even though result value is of type double</title>
                <link>https://jira.mongodb.org/browse/SERVER-6197</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Observed behavior: $avg on integers is calculated using integer addition and division, as a result of which the average of ( 1, 1, 1, ..., 1, 0 ) is 0 and is reported as the double value 0.0.&lt;br/&gt;
Expected behavior: $avg is computed and reported using double values.&lt;/p&gt;

&lt;p&gt;Test:&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;   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;c = db.c;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;c.drop();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;// Insert 1000 one values and 1 zero value.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;for( i = 0; i &amp;lt; 1000; ++i ) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    c.save( { a:NumberInt( 1 ) } );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;c.save( { a:NumberInt( 0 ) } );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;// The average is currently reported as 0.0.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;printjson( c.aggregate( { $group:{ _id:0, avg:{ $avg:&apos;$a&apos; } } } ) );&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;There is also some seemingly arbitrary overflow behavior, for example two ints will overflow on a shard but not on a standalone mongod.&lt;/p&gt;</description>
                <environment></environment>
        <key id="42244">SERVER-6197</key>
            <summary>$avg is calculated using integer math for integers even though result value is of type double</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="9">Done</resolution>
                                        <assignee username="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Sun, 24 Jun 2012 23:17:52 +0000</created>
                <updated>Wed, 28 Oct 2015 04:26:24 +0000</updated>
                            <resolved>Fri, 27 Jul 2012 19:58:18 +0000</resolved>
                                                    <fixVersion>2.2.0-rc1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="148261" author="auto" created="Fri, 27 Jul 2012 19:52:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-23T14:27:55-07:00&apos;, u&apos;email&apos;: u&apos;dannenberg.matt@gmail.com&apos;, u&apos;name&apos;: u&apos;Matt Dannenberg&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6275&quot; title=&quot;$avg assume 0 for undefined&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6275&quot;&gt;&lt;del&gt;SERVER-6275&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6197&quot; title=&quot;$avg is calculated using integer math for integers even though result value is of type double&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6197&quot;&gt;&lt;del&gt;SERVER-6197&lt;/del&gt;&lt;/a&gt; use double for $avg&lt;/p&gt;

&lt;p&gt;also do not count non-numeric types in $avg&lt;br/&gt;
also part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6166&quot; title=&quot;consider expanding to wider data type on math overflow&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6166&quot;&gt;&lt;del&gt;SERVER-6166&lt;/del&gt;&lt;/a&gt; up convert from int to long on $sum&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/186c5a411c3a1e616f7e876820a13af46d6faa4c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/186c5a411c3a1e616f7e876820a13af46d6faa4c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="145727" author="aaron" created="Sat, 21 Jul 2012 17:32:38 +0000"  >&lt;p&gt;Putting in rc1 and assigning to Mathias based on Mathias&apos;s comment in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6166&quot; title=&quot;consider expanding to wider data type on math overflow&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6166&quot;&gt;&lt;del&gt;SERVER-6166&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="136320" author="aaron" created="Mon, 25 Jun 2012 16:00:38 +0000"  >&lt;p&gt;The reasoning for the described expected behavior is that it is a simple way to ensure consistency of aggregation pipeline behaviors.  These (currently implemented) behaviors are:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;$divide performs division by coercing its operands to doubles and returning a double result value (even if the operands are integers)&lt;/li&gt;
	&lt;li&gt;$avg performs division using the type of the operand (which may be an integer) but then always returns a double result value&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If $avg were to coerce its operands to doubles as part of its division step, the implementation would be consistent with $divide and with $avg&apos;s own return data type.&lt;/p&gt;

&lt;p&gt;I think avoiding implicit double conversions is a reasonable policy.  But if we want to adopt that policy we should apply it across the board, including to $divide and anywhere else it may apply.&lt;/p&gt;

&lt;p&gt;Maybe it&apos;s worth creating a separate ticket to decide about implicit double conversions and have this ticket depend on that one?&lt;/p&gt;</comment>
                            <comment id="136233" author="schwerin" created="Mon, 25 Jun 2012 13:38:44 +0000"  >&lt;p&gt;I object to the &quot;expected&quot; behavior.  We should follow the behavior of C and Python, and not coerce to double unless (1) a double appears in the pipeline, or (2) an explicit coercion is specified by the user.  Consider the case of average very large 64-bit integers.  The &quot;average&quot; computed using doubles will be less precise than that computed using 64-bit integers.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="42294">SERVER-6203</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="42052">SERVER-6166</issuekey>
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