@Override
  public String getCreateIndexStatement(String indexName, String tableName, boolean isUnique,
                                        String... columnNames) {
    //TODO validateColumnNames()
    String createIndex = databasePlatform.buildCreateIndex(tableName, indexName, "", isUnique, columnNames);
    return createIndex;
  }
get create index statement
@param indexName The name of the index to be created
@param tableName The database table the index to be created on
@param columnNames The columns included into the index
@param  isUnique Specifies whether unique index is to be created.
@return The sql statement for creating the index
ambari-server/src/main/java/org/apache/ambari/server/orm/helpers/dbms/GenericDbmsHelper.java