public OperationHandle getColumns(String catalogName, String schemaName,
String tableName, String columnName) throws HiveSQLException {
acquire(true);
OperationManager operationManager = getOperationManager();
GetColumnsOperation operation = operationManager.newGetColumnsOperation(getSession(),
catalogName, schemaName, tableName, columnName);
OperationHandle opHandle = operation.getHandle();
try {
operation.run();
opHandleSet.add(opHandle);