Fix the warning when colname_spannersub is used in as_gt()
#1154
| Job | Run time |
|---|---|
| 4m 27s | |
| 4m 27s |
colname_spannersub is used in as_gt()
#1154
| Job | Run time |
|---|---|
| 4m 27s | |
| 4m 27s |