r - How to make join operations in dplyr silent?

Question

dplyr (version 0.4.1) prints the colnames by which it is performing the join. Is it possible to turn this option off?

R code:

library(dplyr)
a=data.frame(x=1,y=2)
b=data.frame(x=1,z=10)
aa=inner_join(a,b)

for the last line, dplyr prints:

Joining by: "x"

that is nice for interactive work, but I am running in Rscript and all these lines are clogging my screen.

Answer 1

If you want to be heavy-handed, you can do

aa = suppressMessages(inner_join(a, b))

The better choice, as Jazzurro suggests, is to specify the by argument. dplyr only prints a message to let you know what its guess is for which columns to join by. If you don't make it guess, it doesn't confirm things with you. This is a safer choice as well, from defensive coding standpoint.

If this is in a knitr document, you can set the chunk option message=FALSE.