Batched concept. Propose dropping Batched from names

[xiaodaigh]

I finally got why the name has Batched. It's because in Batched we are returning more than one value at a time hence "batched". If returning record by record (i.e. row by row) then it is returning one value per column at a time; this is not batched.

But in Julia and in Python and R, most tabular structures like DataFrames are stored columnar, i.e. it is natural to read multiple values at a time. Also, batched is not used anywhere else in the data ecosystem. Hence I suggest removing the Batched in the name, as reading things in batch mode is the norm.