Hello, mrsocks.
No, this is not correct.
If "input_row.fromUserId" is String, you have to use "" in the param. Like this:

if(input.equals("null")||input.equals("3")||input.equals("4"))
       {
           input = "null";
       }
       else
       {
           input = input;
       }

Try it!

Diego wrote:

Hello, mrsocks.
No, this is not correct.
If "input_row.fromUserId" is String, you have to use "" in the param. Like this:

if(input.equals("null")||input.equals("3")||input.equals("4"))
       {
           input = "null";
       }
       else
       {
           input = input;
       }

Try it!

the input is an Integer, so I will leave out the double quotes, correct?

Also,
you have 'input = input;' as the result. Is that correct? I would expect it to be 'output = input;' OR 'output = null;'
Which would actually be correct? If yours, then do I still include:
'output_row.fromUserId  = input_row.fromUserId'; after this IF ELSE ?

Thanks.