func:addCols

addCols(a, b)

Add grid b as a new set of columns to grid a. If b contains duplicate column names, then they are given auto-generated unique names. If b contains fewer rows then a, then the missing cells are filled with null.

Examples:

[{a:0, b:2}, {a:1, b:3}].toGrid.addCols({c:4}.toGrid)
readAll(rtu).addCols(readAll(meter))