jonkeane commented on a change in pull request #11613:
URL: https://github.com/apache/arrow/pull/11613#discussion_r746596726
##########
File path: r/R/parquet.R
##########
@@ -196,7 +196,27 @@ write_parquet <- function(x,
allow_truncated_timestamps = allow_truncated_timestamps
)
)
- writer$WriteTable(x, chunk_size = chunk_size %||% x$num_rows)
+
+ # determine an approximate chunk size
+ if (is.null(chunk_size)) {
+ num_cells <- x$num_rows * x$num_columns
+ target_cells_per_group <- getOption("arrow.parquet_cells_per_group", 2.5e8)
Review comment:
Ah yes, yes. The value is right, but my comment was from a time when I
was using a lower number, I'll update it
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