[GitHub] [arrow] eitsupi commented on a diff in pull request #13005: ARROW-16276: [R] Arrow 8.0 News

[GitBox <gi...@apache.org>]

eitsupi commented on code in PR #13005:
URL: https://github.com/apache/arrow/pull/13005#discussion_r862313809


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r/NEWS.md:
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@@ -19,19 +19,123 @@
 
 # arrow 7.0.0.9000
 
-* `read_csv_arrow()`'s readr-style type `T` is now mapped to `timestamp(unit = "ns")` instead of `timestamp(unit = "s")`.
-* `lubridate`:
-  * component extraction functions: `tz()` (timezone), `semester()` (semester), `dst()` (daylight savings time indicator), `date()` (extract date), `epiyear()` (epiyear), improvements to `month()`, which now works with integer inputs.
-  * Added `make_date()` & `make_datetime()` + `ISOdatetime()` & `ISOdate()` to create date-times from numeric representations. 
-  * Added `decimal_date()` and `date_decimal()`
-  * Added `make_difftime()` (duration constructor)
-  * Added duration helper functions: `dyears()`, `dmonths()`, `dweeks()`, `ddays()`, `dhours()`, `dminutes()`, `dseconds()`, `dmilliseconds()`, `dmicroseconds()`, `dnanoseconds()`.
-* date-time functionality:
-  * Added `as_date()` and `as_datetime()`
-  * Added `difftime` and `as.difftime()` 
-  * Added `as.Date()` to convert to date
+## Enhancements to dplyr and datasets
+
+* `open_dataset()`:
+  - correctly supports the `skip` argument for skipping header rows in CSV datasets.
+  - can take a list of datasets with differing schemas and attempt to unify the 
+    schemas to produce a `UnionDataset`.
+* Arrow `{dplyr}` queries:
+  - are supported on `RecordBatchReader`. This allows, for example, results from DuckDB
+  to be streamed back into Arrow rather than materialized before continuing the pipeline.
+  - no longer need to materialize the entire result table before writing to a dataset
+    if the query contains contains aggregations or joins.
+  - now supports `dplyr::rename_with()`.
+  - `dplyr::count()` now returns an ungrouped dataframe.
+* `write_dataset()` now has more options for controlling row group and file sizes when
+  writing partitioned datasets, such as `max_open_files`, `max_rows_per_file`, 
+  `min_rows_per_group`, and `max_rows_per_group`.
+* `write_csv_arrow()` can write a `Dataset` or an Arrow dplyr query to a single file.
+  - supports `dplyr::rename_with()`.
+  - `dplyr::count()` returns an ungrouped dataframe.
+* `write_dataset` has more options for controlling row group and file sizes when
+  writing partitioned datasets, such as `max_open_files`, `max_rows_per_file`, 
+  `min_rows_per_group`, and `max_rows_per_group`.
+* `write_csv_arrow` accepts a `Dataset` or an Arrow dplyr query.
+* Joining one or more datasets while `option(use_threads = FALSE)` no longer
+  crashes R. That option is set by default on Windows.
+* `dplyr` joins support the `suffix` argument to handle overlap in column names.
+* Filtering a Parquet dataset with `is.na()` no longer misses any rows.
+* `map_batches()` correctly accepts `Dataset` objects.
+
+## Enhancements to date and time support
+
+* `read_csv_arrow()`'s readr-style type `T` is mapped to `timestamp(unit = "ns")` 
+  instead of `timestamp(unit = "s")`.
+* For Arrow dplyr queries, added additional `{lubridate}` features and fixes:
+  * New component extraction functions: 
+    * `lubridate::tz()` (timezone),
+    * `lubridate::semester()` (semester), 
+    * `lubridate::dst()` (daylight savings time indicator),
+    * `lubridate::date()` (extract date), 
+    * `lubridate::epiyear()` (epiyear),
+  * `lubridate::month()` works with integer inputs.
+  * Added `lubridate::make_date()` & `lubridate::make_datetime()` + 
+    `lubridate::ISOdatetime()` & `lubridate::ISOdate()` to 
+    create date-times from numeric representations. 
+  * Added `lubridate::decimal_date()` and `lubridate::date_decimal()`
+  * Added `lubridate::make_difftime()` (duration constructor)
+  * Added `?lubridate::duration` helper functions, such as `dyears()`, `dhours()`, `dseconds()`.
+  * Added `lubridate::leap_year()`
+  * Added `lubridate::as_date()` and `lubridate::as_datetime()`
+* Also for Arrow dplyr queries, added support for base date and time functions:
+  * Added `base::difftime` and `base::as.difftime()` 
+  * Added `base::as.Date()` to convert to date
+  * Arrow timestamp and date arrays support `base::format()`
+  * `strptime()` returns `NA` instead of erroring in case of format mismatch,
+    just like `base::strptime()`.
+* Timezone operations are now supported on Windows if the 
+  [tzdb package](https://cran.r-project.org/package=tzdb) is also
+* Timezone operations are supported on Windows if the 

Review Comment:
   These lines should be removed.



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