Change Data Capture Developer Guide

Change Data Capture
Keep Your External Data Current with Change Data Capture
Change Event Message Structure
Subscribe to Change Events
Security Considerations
Change Event Considerations
Standard Object Notes
Change Events for Fields
Sending Data Differences for Fields of Updated Records
Change Events for Custom Field Type Conversions
Conversions That Generate a Change Event
Conversions That Generate a Gap Event
Conversions That Don’t Generate Events
Other Types of Change Events: Gap and Overflow Events
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Change Events for Custom Field Type Conversions

When you change the type of a custom field, a change event or gap event is generated for data changes for some conversions. Other conversions, such as those that preserve or truncate field values, don't generate events.