nealrichardson commented on code in PR #12751:
URL: https://github.com/apache/arrow/pull/12751#discussion_r853381335
##########
r/R/record-batch.R:
##########
@@ -189,3 +189,56 @@ record_batch <- RecordBatch$create
#' @export
names.RecordBatch <- function(x) x$names()
+
+#' @export
+rbind.RecordBatch <- function(...) {
+ abort("Use `Table$create()` to combine RecordBatches into a Table")
+}
+
+cbind_check_length <- function(inputs, call = caller_env()) {
+ sizes <- map_int(inputs, NROW)
+ ok_lengths <- sizes %in% c(head(sizes, 1), 1L)
+ if (!all(ok_lengths)) {
+ first_bad_one <- which.min(ok_lengths)
+ abort(
+ c("Non-scalar inputs must have an equal number of rows.",
+ i = sprintf("..1 has %d, ..%d has %d", sizes[[1]], first_bad_one,
sizes[[first_bad_one]])),
+ call = call
+ )
+ }
+}
+
+#' @export
+cbind.RecordBatch <- function(...) {
+ call <- sys.call()
+ inputs <- list(...)
+ arg_names <- if (is.null(names(inputs))) {
+ rep("", length(inputs))
+ } else {
+ names(inputs)
+ }
+
+ cbind_check_length(inputs, call)
+
+ columns <- flatten(map(seq_along(inputs), function(i) {
+ input <- inputs[[i]]
+ name <- arg_names[i]
+
+ if (inherits(input, "RecordBatch")) {
+ set_names(input$columns, names(input))
+ } else if (inherits(input, "data.frame")) {
+ as.list(input)
+ } else if (inherits(input, "Table") || inherits(input, "ChunkedArray")) {
+ abort("Cannot cbind a RecordBatch with Tables or ChunkedArrays",
+ i = "Hint: consider converting the record batch into a Table
first")
Review Comment:
```suggestion
i = "Hint: consider converting the RecordBatch into a Table
first")
```
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