liquibase-core/src/main/java/liquibase/change/AbstractChange.java
@SuppressWarnings("UnusedParameters")
    protected String createMustEqualExistingMetaData(
        String parameterName, DatabaseChangeProperty changePropertyAnnotation
    ) {
        if (changePropertyAnnotation == null) {
            return null;
        }

        return changePropertyAnnotation.mustEqualExisting();
    }
@SuppressWarnings("UnusedParameters")
    protected String createMustEqualExistingMetaData(
        String parameterName, DatabaseChangeProperty changePropertyAnnotation
    ) {
        if (changePropertyAnnotation == null) {
            return null;
        }

        return changePropertyAnnotation.mustEqualExisting();
    }
Create the {@link ChangeParameterMetaData} "mustEqual" value. Uses the value on the DatabaseChangeProperty
annotation or returns null as a default.