Improved Caching of Org Schema (Critical Update) - Change event entities added in later API versions are visible in lower version
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Improved Caching of Org Schema (Critical Update) - Change event entities added in later API versions are visible in lower version

Apex , Spring 20

Last updated 2020-05-28 ·Reference W-7427251 ·Reported By 1 users

Fixed - Spring '20 Patch 18.0

After enabling Improved Caching of Org Schema (Critical Update) and if the apex class version is greater than 40.0 and less than 48.0 then the logic to get child relationships will improperly return child relationships to SObject types that are not in the global describe. More specifically the Schema.DescribeFieldResult#getChildSObject() method will return related SObject types from later versions for Change Data Capture related SObject types.

For example, change event entities added after 40.0 (like AccountContactRoleChangeEvent added in 43.0) is visible in API version 40.0.

The known impact is currently restricted to change data capture SObject types (i.e. relationships to *ChangeEvent types).

1) Create the following test apex class with API version 40.0
2) Enable Improved Caching of Org Schema critical update in the org.
3) Run the test class.

====Code Snippet Begin====

public class TestGlobalDescribeChangeEvent {

// introduced in v43
// see

static String accountRoleEvent = 'AccountContactRoleChangeEvent';
public static testMethod void testAccountChangeRole() {

String uniqueUserName = 'sysadminUser' + + '';
// This code runs as the system user
Profile p = [SELECT Id FROM Profile WHERE Name='System Administrator'];

User u = new User(Alias = 'sysadmin', Email='', EmailEncodingKey='UTF-8',
LastName='Testing', LanguageLocaleKey='en_US', LocaleSidKey='en_US', ProfileId = p.Id,

System.runAs(u) {
Map<String, SObjectType> gdMap = Schema.getGlobalDescribe();
Schema.DescribeSObjectResult metadata = Account.sObjectType.getDescribe();

for (Schema.ChildRelationship relationship : metadata.getChildRelationships()) {
String relatedTo = '' + relationship.getChildSObject();
if (relatedTo.equals(accountRoleEvent)) {

// should not be able to see AccountContactRoleChangeEvent added in v43
//Critical update will break this - assert will pass with Critical Update disabled, fails with Critical Update enabled

System.assertEquals( true, gdMap.containsKey(accountRoleEvent), 'Can see a newer entity in older api version!');

====Code Snippet End====

Disable the Improved Caching of Org Schema critical update or change the api version of the class to the latest.

This issue has been fixed by the 'Enable improved caching of org schema' critical update.

See release notes here,
Knowledge Article,

Reported By (1)

Is it Fixed?

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