public OperationHandle getFunctions(String catalogName, String schemaName, String functionName)
throws HiveSQLException {
acquire(true);
OperationManager operationManager = getOperationManager();
GetFunctionsOperation operation = operationManager
.newGetFunctionsOperation(getSession(), catalogName, schemaName, functionName);
OperationHandle opHandle = operation.getHandle();
try {
operation.run();
opHandleSet.add(opHandle);