grapes-greater-than-grapes: Infix operator for composing a lambda expression

In rstudio/sparklyr: R Interface to Apache Spark

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

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

## Not run: 

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)

## End(Not run)

rstudio/sparklyr documentation built on Sept. 18, 2024, 6:10 a.m.