use of copystage and modify stage

4friends · Post by **4friends** » Thu Nov 22, 2007 4:20 am

can anyone explain what are the uses of copy stage and modify stage in what situation can we use?

ray.wurlod · Post by **ray.wurlod** » Thu Nov 22, 2007 4:53 am

Copy stage makes zero or more copies of its input. You may drop or rename columns, but not change the data in any other way.

Modify stage is a very fast stage for performing certain simple, single-argument functions on data. Vincent has posted a blog on how to become a Modify stage Zen master.

vmcburney · Post by **vmcburney** » Thu Nov 22, 2007 4:55 pm

And Andy Sorrell has a Modify Stage video tutorial which has some good syntax examples. Both stages are faster than the Transformer stage for specialised tasks but the Transformer is easier to use if you are doing multiple tasks in one step (constraints and transforms and copies).