@Override
  public String getCreateIndexStatement(String indexName, String tableName,
                                        String... columnNames) {
    return getCreateIndexStatement(indexName, tableName, false, columnNames);
  }
get create index statement
@param indexName
@param tableName
@param columnNames
@return
ambari-server/src/main/java/org/apache/ambari/server/orm/helpers/dbms/GenericDbmsHelper.java