Reorder operator attributes

[Hor911]

Most important attributes should go first

Currently:

TableFullScan (ReadColumns: ["n_name","n_nationkey"], ReadRanges: ["n_nationkey (-∞, +∞ )"], Table: tpch10/nation) 

Proposed:

FullScan (Table: "tpch10/nation", Columns: ["n_name","n_nationkey"])