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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/29 11:58:26 UTC
[GitHub] [arrow] paleolimbot commented on a diff in pull request #13005: ARROW-16276: [R] Arrow 8.0 News
paleolimbot commented on code in PR #13005:
URL: https://github.com/apache/arrow/pull/13005#discussion_r861728055
##########
r/NEWS.md:
##########
@@ -19,19 +19,111 @@
# 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()`:
+ - now correctly supports the `skip` argument for skipping header rows in CSV datasets.
+ - now can take a list of datasets with differing schemas and attempt to unify the
+ schemas to produce a `UnionDataset`.
+* Arrow `{dplyr}` queries:
+ - are now supported on `RecordBatchReader`. This allows 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
Review Comment:
```suggestion
* `write_dataset()` now has more options for controlling row group and file sizes when
```
##########
r/NEWS.md:
##########
@@ -19,19 +19,111 @@
# 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()`:
+ - now correctly supports the `skip` argument for skipping header rows in CSV datasets.
+ - now can take a list of datasets with differing schemas and attempt to unify the
+ schemas to produce a `UnionDataset`.
+* Arrow `{dplyr}` queries:
+ - are now supported on `RecordBatchReader`. This allows 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` now 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 now support the `suffix` argument to handle overlap in column names.
+* Filtering a Parquet dataset with `is.na()` no longer misses any rows.
+* `map_batches()` no longer errors if passed a `Dataset` object.
+
+## Enhancements to date and time support
+
+* `read_csv_arrow()`'s readr-style type `T` is now 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()` now 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 now support `base::format()`
+ * `strptime()` now 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/web/packages/tzdb/index.html) is also
+ installed.
+
+## Extension Array Support
+
+Custom extension arrays can be created and registered, allowing other packages to
+define their own array types. Extension arrays wrap regular Arrow array types and
+provide customized behavior and/or storage. A common use-case for extension types
+is to define a customized conversion between an an Arrow Array and an R object
+when the default conversion is slow or looses metadata important to the interpretation
+of values in the array. For most types, the built-in vctrs extension type is probably
+sufficient. See description and an example with `?new_extension_type`.
+
+## Concatenation Support
+
+Arrow arrays and tables can now be easily concatenated:
+
+ * Arrays can now be concatenated with `concat_arrays()` or, if zero-copy is desired
+ and chunking is acceptable, using `ChunkedArray$create()`.
+ * Chunked arrays can now be concatenated with `c()`.
+ * Record batches and tables now support `cbind()`.
+ * Arrow tables now support `rbind()`. `concat_tables()` is also provided to
+ concatenate tables while unifying schemas.
+
+## S3 Conversion Generics
+
+Arrow now provides S3 generic conversion functions such as `as_arrow_array()`
+and `as_chunked_array()` for main Arrow objects. This includes, Arrow tables,
Review Comment:
```suggestion
and `as_arrow_table()` for main Arrow objects. This includes, Arrow tables,
```
##########
r/NEWS.md:
##########
@@ -19,19 +19,111 @@
# 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()`:
+ - now correctly supports the `skip` argument for skipping header rows in CSV datasets.
+ - now can take a list of datasets with differing schemas and attempt to unify the
+ schemas to produce a `UnionDataset`.
+* Arrow `{dplyr}` queries:
+ - are now supported on `RecordBatchReader`. This allows 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` now 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 now support the `suffix` argument to handle overlap in column names.
+* Filtering a Parquet dataset with `is.na()` no longer misses any rows.
+* `map_batches()` no longer errors if passed a `Dataset` object.
+
+## Enhancements to date and time support
+
+* `read_csv_arrow()`'s readr-style type `T` is now 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()` now 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 now support `base::format()`
+ * `strptime()` now 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/web/packages/tzdb/index.html) is also
Review Comment:
```suggestion
[tzdb package](https://cran.r-project.org/package=tzdb) is also
```
(I know that's a weird URL, but not using the 'canonical version' triggers a check NOTE, or used to, on the CMD check)
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