SQL & PL/SQL :: Execute The Expression In Select Statement

CREATE TABLE TEST1
(
OFFICE_PRODUCTS NUMBER,
OFFICE_ELECTRONICS NUMBER
)
Insert into TEST1 (OFFICE_PRODUCTS, OFFICE_ELECTRONICS) Values(1, 0);
COMMIT;

CREATE TABLE TEST2
(
EXPORT_FIELD_NAME VARCHAR2(100 BYTE),
EXPORT_COLUMN_EXPRESSION VARCHAR2(100 BYTE)
)
Insert into TEST2
(EXPORT_FIELD_NAME, EXPORT_COLUMN_EXPRESSION)
Values ('A1', 'least(OFFICE_PRODUCTS, OFFICE_ELECTRONICS)');
COMMIT;

I want to be execute the expression should run in select statement how to do? and tried as like below,it's not working.

select (select EXPORT_COLUMN_EXPRESSION from test2 where EXPORT_FIELD_NAME='A1') FROM TEST1;