
mlr --csv remove-empty-columns ./reg-test/input/remove-empty-columns.csv
b,c,d
2,3,4
6,,8
,11,12

mlr --from ./reg-test/input/s.csv --icsv --opprint remove-empty-columns
a   b   i x                   y
pan pan 1 0.3467901443380824  0.7268028627434533
eks pan 2 0.7586799647899636  0.5221511083334797
wye wye 3 0.20460330576630303 0.33831852551664776
eks wye 4 0.38139939387114097 0.13418874328430463

mlr --from ./reg-test/input/remove-empty-columns.csv --icsv --opprint cat
a b c  d
- 2 3  4
- 6 -  8
- - 11 12

mlr --from ./reg-test/input/remove-empty-columns.csv --icsv --opprint remove-empty-columns
b c  d
2 3  4
6 -  8
- 11 12

mlr --icsv --opprint fill-down -f z ./reg-test/input/remove-empty-columns.csv
a b c  d
- 2 3  4
- 6 -  8
- - 11 12

mlr --icsv --opprint fill-down -f a,b,c,d ./reg-test/input/remove-empty-columns.csv
a b c  d
- 2 3  4
- 6 3  8
- 6 11 12

