jonkeane commented on a change in pull request #11783:
URL: https://github.com/apache/arrow/pull/11783#discussion_r762070759
##########
File path: r/tests/testthat/test-parquet.R
##########
@@ -311,3 +311,7 @@ test_that("ParquetFileWrite chunk_size defaults", {
expect_error(reader$ReadRowGroup(2), "Some index in row_group_indices")
})
})
+
+test_that("ParquetFileWrite chunk_size calculation doesn't have integer
overflow issues (ARROW-14894)", {
+ expect_equal(calculate_chunk_size(31869547, 108, 2.5e8, 200), 2451504)
Review comment:
```suggestion
expect_equal(calculate_chunk_size(31869547, 108, 2.5e8, 200), 2451504)
# we can set the target cells per group, and it rounds appropriately
expect_equal(calculate_chunk_size(100, 1, 25), 25)
expect_equal(calculate_chunk_size(101, 1, 25), 26)
# but our max_chunks is respected
expect_equal(calculate_chunk_size(101, 1, 25, 2), 51)
```
These are kinda-sorta the same tests as above, so we don't _need_ to include
them but I find these a bit easier to reason about (and certainly easier to
test than constructing a whole dataset!)
##########
File path: r/R/parquet.R
##########
@@ -608,3 +593,28 @@ ParquetArrowReaderProperties <-
R6Class("ParquetArrowReaderProperties",
ParquetArrowReaderProperties$create <- function(use_threads =
option_use_threads()) {
parquet___arrow___ArrowReaderProperties__Make(isTRUE(use_threads))
}
+
+calculate_chunk_size <- function(rows, columns,
+ target_cells_per_group = getOption("arrow.parquet_cells_per_group", 2.5e8),
+ max_chunks = getOption("arrow.parquet_max_chunks", 200)
+ ){
Review comment:
```suggestion
) {
```
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