Apply prefix outside translation to get identical messages in gettext

Author: MichaelChirico

R/merge.R

@@ -100,12 +100,12 @@ merge.data.table = function(x, y, by = NULL, by.x = NULL, by.y = NULL, all = FAL
   dt = tryCatch(
     y[x, nomatch=if (all.x) NA else NULL, on=by, allow.cartesian=allow.cartesian],
     dt_bmerge_incompatible_type_error = function(e) {
-      x_part_col_name = e$bmerge_i_arg_col_name
+      x_part_col_name = paste0("x.", e$bmerge_i_arg_col_name)
       x_part_type     = e$bmerge_i_arg_type
-      y_part_col_name = e$bmerge_x_arg_col_name
+      y_part_col_name = paste0("y.", e$bmerge_x_arg_col_name)
       y_part_type     = e$bmerge_x_arg_type
 
-      stopf("Incompatible join types: x.%s (%s) and y.%s (%s). Factor columns must join to factor or character columns.", x_part_col_name, x_part_type, y_part_col_name, y_part_type, class = "dt_merge_incompatible_type_error")
+      stopf("Incompatible join types: %s (%s) and %s (%s). Factor columns must join to factor or character columns.", x_part_col_name, x_part_type, y_part_col_name, y_part_type, class = "dt_merge_incompatible_type_error")
     }
   )