%->%
Infix operator for composing a lambda expression
Description
Infix operator that allows a lambda expression to be composed in R and be translated to Spark SQL equivalent using ’ dbplyr::translate_sql functionalities
Usage
params %->% ...Arguments
| Argument | Description |
|---|---|
| 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
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)