addCheckConstraint

...
<changeSet  author="liquibase-docs"  id="addCheckConstraint-example">  
    <pro:addCheckConstraint  catalogName="cat"  
            constraintName="const_name"  
            disabled="true"  
            schemaName="public"  
            tableName="person"  
            validate="true">A String</pro:addCheckConstraint>  
</changeSet>
...

...
-  changeSet:  
    id:  addCheckConstraint-example  
    author:  liquibase-docs  
    changes:  
    -  addCheckConstraint:  
        catalogName:  cat  
        constraintBody:  A String  
        constraintName:  const_name  
        disabled:  true  
        schemaName:  public  
        tableName:  person  
        validate:  true
...

...
{
  "changeSet":  {
    "id":  "addCheckConstraint-example",
    "author":  "liquibase-docs",
    "changes":  [{
      "addCheckConstraint":  {
      "catalogName":  "cat",
      "constraintBody":  "A String",
      "constraintName":  "const_name",
      "disabled":  true,
      "schemaName":  "public",
      "tableName":  "person",
      "validate":  true
      }
    }]
  }
}
...

...
--changeset liquibase-docs:addCheckConstraint-example
ALTER  TABLE  cat.[public].person  ADD  CONSTRAINT  const_name  CHECK  (A  String);
ALTER  TABLE  cat.[public].person  NOCHECK  CONSTRAINT  const_name;
...