Not necessarily, because it's harmless. It's there for purely aesthetical reasons, so it's your choice whether to add it or not. Having it there is slightly easier on somebody reading the code, perhaps.
On my side, that's up to you Fujii-san. The patch does what it states, I only think that this extra 0 should be added either everywhere or nowhere. Not mandatory either: drop test_param_unit in the regression tests after running the test queries.
