code: private void setValidateOptionIfAvailable(Database database, UniqueConstraint uniqueConstraint, Map<String, ?> columnsMetadata) {
          if (!(database instanceof OracleDatabase)) {
              return;
          }
          final Object constraintValidate = columnsMetadata.get("CONSTRAINT_VALIDATE");
          final String VALIDATE = "VALIDATED";
          if (constraintValidate!=null && !constraintValidate.toString().trim().isEmpty()) {
              uniqueConstraint.setShouldValidate(VALIDATE.equals(cleanNameFromDatabase(constraintValidate.toString().trim(), database)));
          }
      }
docs: Method to map 'validate' option for UC. This thing works only for ORACLE
  
  @param database - DB where UC will be created
  @param uniqueConstraint - UC object to persist validate option
  @param columnsMetadata - it's a cache-map to get metadata about UC