Ok after a lot of digging and just mashing of keys... I figured it out.
using JuliaDB
t = table((x = [1,4,5,6], y = [2,2,24,5]))
Table with 4 rows, 2 columns:
x y
─────
1 2
4 2
5 24
6 5
t = transform(t, :y => (:x, :y) => row -> row.x == 4 ? 99.0 : row.y)
Table with 4 rows, 2 columns:
x y
───────
1 2
4 99.0
5 24
6 5
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…