Pig If Else semantics

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0

I have something like

a = LOAD 'input-1';
b = LOAD 'input-2';
c = UNION a,b;

where input-1 is a directory and may be sometimes empty. Whenever it is empty, the UNION throws some exception as a is NULL. UNION is just one operation here, it could be any other operation like JOIN a BY $0, b BY $0, etc.

Is it possible to check the nullness of "a" in Pig, before using it any sub sequent operation ?

asked 1 min ago

user1084874

11