Github user huaxingao commented on a diff in the pull request: https://github.com/apache/spark/pull/21255#discussion_r187262627 --- Diff: R/pkg/R/functions.R --- @@ -219,7 +219,8 @@ NULL #' head(select(tmp3, map_values(tmp3$v3))) #' head(select(tmp3, element_at(tmp3$v3, "Valiant"))) #' tmp4 <- mutate(df, v4 = create_array(df$mpg, df$cyl), v5 = create_array(df$hp)) -#' head(select(tmp4, concat(tmp4$v4, tmp4$v5)))} +#' head(select(tmp4, concat(tmp4$v4, tmp4$v5))) +#' concat(df$mpg, df$cyl, df$hp)} --- End diff -- @felixcheung Yes, the numeric columns work OK with concat. I tested and it has the following +--------------------+ |concat(mpg, cyl, hp)| +--------------------+ | 21.06.0110.0| | 21.06.0110.0| Is it OK with you to have the example as ```head(select(tmp, concat(df$mpg, df$cyl, df$hp)))``` ? Somehow, the test failed with ```head(mutate(df, s1 = concat(df$mpg, df$cyl, df$hp))```
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