| when {SparkR} | R Documentation | 
Evaluates a list of conditions and returns one of multiple possible result expressions. For unmatched expressions null is returned.
when(condition, value) ## S4 method for signature 'Column' when(condition, value)
| condition | the condition to test on. Must be a Column expression. | 
| value | result expression. | 
when since 1.5.0
Other normal_funcs: abs,
bitwiseNOT, coalesce,
column, expr,
from_json, greatest,
ifelse, isnan,
least, lit,
nanvl, negate,
randn, rand,
struct, to_json
## Not run: when(df$age == 2, df$age + 1)