Currently we project all the columns from a table in the projection. We can project SELECT t.* for generate shorter SQL.
Notes to implementer:

• Best place to do would be SQL Gen. Method GenerateProjection. We can detect that all the projection expressions are column expression and coming from same table then we can use table.* directly.
• Overriding method will allow provider to change the "optimization". e.g. postgres does not project "xmin" column out of the table, SELECT * in such cases, need to list all the columns.