nealrichardson commented on a change in pull request #11355:
URL: https://github.com/apache/arrow/pull/11355#discussion_r725225030



##########
File path: r/R/expression.R
##########
@@ -215,7 +215,7 @@ build_expr <- function(FUN,
     } else if (FUN == "%/%") {
       # In R, integer division works like floor(float division)
       out <- build_expr("/", args = args)
-      return(out$cast(int32(), allow_float_truncate = TRUE))
+      return(nse_funcs$floor(out))

Review comment:
       And yes this should be done similarly in arrow-datum.R (but not using 
Expression)
   
   ```suggestion
         return(Expression$create("floor", out))
   ```




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