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In your case, you must instanciate every columns of your OutputSchema from your InputSchema.
You have specified your output for "output_row.utcstamp" but not for others.
My advice is to remove the tJavaRow component, and you write your conditional expression directly in the mapper :
In utcstamp column (output of your tMap_2 component) : row10.count == 0 ? 0 : row10.utcstamp
You can see following Screenshots.