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Is it best practice to use Projection node always in Calc View?

Dear All,

Is it best practice to use Projection node always in Calc View while creating Join or Union .

I did't find any difference in Join and Union while using tables with Projection or without projection .

eg :-

There are there table for Union .

What will be the difference if I put all table directly to Union node Or I put all tables in different projection and then all projection to union node .

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