Infix operator for composing a lambda expression

Source: R/dplyr_hof.R

Infix operator that allows a lambda expression to be composed in R and be translated to Spark SQL equivalent using ' dbplyr::translate_sql functionalities

params %->% ...

Arguments

params

Parameter(s) of the lambda expression, can be either a single parameter or a comma separated listed of parameters in the form of .(param1, param2, ... ) (see examples)

...

Body of the lambda expression, *must be within parentheses*

Details

Notice when composing a lambda expression in R, the body of the lambda expression *must always be surrounded with parentheses*, otherwise a parsing error will occur.

Examples

if (FALSE) { # \dontrun{

a %->% (mean(a) + 1) # translates to <SQL> `a` -> (AVG(`a`) OVER () + 1.0)

.(a, b) %->% (a < 1 && b > 1) # translates to <SQL> `a`,`b` -> (`a` < 1.0 AND `b` > 1.0)
} # }