CalculateTable with If condition

Hi,

I am working on Dynamic row level security.

The requirement is, if the Username() is present in Emp_ad then evaluate table 1 expression else evaluate table 2 expression.

1st expression is:

VAR user_Var=
CALCULATETABLE (
VALUES ( WC_EMPLOYEE_HIERARCHY_DASH_DI[emp_ad] ),
WC_EMPLOYEE_HIERARCHY_DASH_DI[Supervisor_ad] =

UserName()

)
RETURN
EmpIds[emp_ad] IN user_Var

2nd expression is:

var proxy=
CALCULATEtable(
values(Proxy_Table[Proxy_Username]),
Proxy_Table[Username]=UserName()

))
return
proxy_Table[proxy_username] in proxy

Both are working fine individually but I want to add the condition that if username() present in 1st table then evaluate 1st expression if not then 2nd expression.

I tried something like below but its not working. Can anyone please help me on that?

VAR user_Var=
if(CONTAINS(WC_EMPLOYEE_HIERARCHY_DASH_DI,WC_EMPLOYEE_HIERARCHY_DASH_DI[emp_ad] ,

username()
))
,
CALCULATETABLE (
VALUES ( WC_EMPLOYEE_HIERARCHY_DASH_DI[emp_ad] ),
WC_EMPLOYEE_HIERARCHY_DASH_DI[Supervisor_ad] =

username()
)
)
,
if(CONTAINS(Proxy_Table, Proxy_Table[Username] ,
username()
)),

CALCULATETABLE (
VALUES ( proxy_Table[proxy_username] ),
username()
)
)))
RETURN

if((CONTAINS(WC_EMPLOYEE_HIERARCHY_DASH_DI,WC_EMPLOYEE_HIERARCHY_DASH_DI[emp_ad] ,
username()))
), EmpIds[emp_ad] IN user_Var,

proxy_Table[proxy_username] in user_Var)

Thanks,

Rinku