public  StringBuilder writeDropPrimaryKeyStatement(StringBuilder builder, String constraintName, boolean cascade){
      // constraintName required only for postgres
      return builder.append("DROP PRIMARY KEY");
  }
@param builder String Builder passed by reference
@param constraintName Constraint Name used by Postgres
@param cascade In postgres, can perform a CASCADE delete. In the other DB flavors, this is ignored.
@return Return the String Builder
ambari-server/src/main/java/org/apache/ambari/server/orm/helpers/dbms/GenericDbmsHelper.java