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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6206] need a policy for incompatible types in operators in aggregation expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-6206</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We need to decide how we are going to handle cases where aggregation expressions do not have an obviously correct return type. For example, if the user applies $mod with a string or double as an argument, or if the user applies $add with a string and a date.&lt;/p&gt;</description>
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        <key id="42363">SERVER-6206</key>
            <summary>need a policy for incompatible types in operators in aggregation expressions</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="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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="matt.dannenberg">Matt Dannenberg</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jun 2012 18:33:44 +0000</created>
                <updated>Fri, 7 Apr 2023 13:28:07 +0000</updated>
                            <resolved>Mon, 9 Nov 2015 19:46:39 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>2</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1083571" author="charlie.swanson" created="Mon, 9 Nov 2015 19:46:39 +0000"  >&lt;p&gt;Closing as duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6203&quot; title=&quot;Aggregation operators should have well defined implicit type coercion behavior.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6203&quot;&gt;SERVER-6203&lt;/a&gt;. Feel free to re-open and describe the differences between the two tickets if you see any.&lt;/p&gt;</comment>
                            <comment id="797021" author="JIRAUSER1259463" created="Mon, 5 Jan 2015 16:09:47 +0000"  >&lt;p&gt;In addition to error handling for mismatched/incompatible types, it could be beneficial to have a projection operator such as &quot;$castString&quot; or &quot;$cast&quot;:&lt;/p&gt;
{type: &amp;lt;type&amp;gt;, value:&amp;lt;value&amp;gt;}
&lt;p&gt;. We often cast ObjectIds to strings in our application code, but type casting could be useful elsewhere, too. &lt;/p&gt;</comment>
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            <issuelink>
            <issuekey id="41675">SERVER-6125</issuekey>
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            <issuelink>
            <issuekey id="41918">SERVER-6142</issuekey>
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            <issuelink>
            <issuekey id="42179">SERVER-6184</issuekey>
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            <issuelink>
            <issuekey id="42239">SERVER-6196</issuekey>
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