v0.12.1

This version includes a few additional features and a large amount of documentation improvements.

Deprecations

• pl$polars_info() is moved to polars_info(). pl$polars_info() is deprecated and will be removed in 0.13.0 (#662).

Rust-polars update

• rust-polars is updated to 0.36.2 (#659). Most of the changes from 0.35.x to 0.36.2 were covered in R polars 0.12.0.
  The main change is that pl$Utf8 is replaced by pl$String. pl$Utf8 is an alias and will keep working, but pl$String is now preferred in the documentation and in new code.

What's changed

• New methods $str$reverse(), $str$contains_any(), and $str$replace_many() (#641).
• New methods $rle() and $rle_id() (#648).
• New functions is_polars_df(), is_polars_lf(), is_polars_series() (#658).
• $gather() now accepts negative indexing (#659).

Miscellaneous

• Remove the Makefile in favor of Taskfile.yml. Please use task instead of make as a task runner in the development (#654).

lib-v0.36.0

feat: Bump rust-polars to 0.36.2 (#659)

Co-authored-by: eitsupi <ts1s1andn@gmail.com>

v0.12.0

BREAKING CHANGES DUE TO RUST-POLARS UPDATE

• rust-polars is updated to 2023-12-25 unreleased version (#601, #622).
  This is the same version of Python Polars package 0.20.2, so please check
  the upgrade guide for details too.
  • pl$scan_csv() and pl$read_csv()'s comment_char argument is renamed comment_prefix.
  • <DataFrame>$frame_equal() and <Series>$series_equal() are renamed
    to <DataFrame>$equals() and <Series>$equals().
  • <Expr>$rolling_* functions gained an argument warn_if_unsorted.
  • <Expr>$str$json_extract() is renamed to <Expr>$str$json_decode().
  • Change default join behavior with regard to null values.
  • Preserve left and right join keys in outer joins.
  • count now ignores null values.
  • NaN values are now considered equal.
  • $gather_every() gained an argument offset.

Breaking changes and deprecations

• $apply() on an Expr or a Series is renamed $map_elements(), and $map()
  is renamed $map_batches(). $map() and $apply() will be removed in 0.13.0 (#534).
• Removed $days(), $hours(), $minutes(), $seconds(), $milliseconds(),
  $microseconds(), $nanoseconds(). Those were deprecated in 0.11.0 (#550).
• pl$concat_list(): elements being strings are now interpreted as column names.
  Use pl$lit to concat with a string.
• <RPolarsExpr>$lit_to_s() is renamed to <RPolarsExpr>$to_series() (#582).
• <RPolarsExpr>$lit_to_df() is removed (#582).
• Change class names and function names associated with class names.
  • The class name of all objects created by polars (DataFrame, LazyFrame,
    Expr, Series, etc.) has changed. They now start with RPolars, for example
    RPolarsDataFrame. This will only break your code if you directly use those
    class names, such as in S3 methods (#554, #585).
  • Private methods have been unified so that they do not have the RPolars prefix (#584).

What's changed

• The Extract function ([) for DataFrame can use columns not included in the
  result for filtering (#547).
• The Extract function ([) for LazyFrame can filter rows with Expressions (#547).
• as_polars_df() for data.frame has a new argument rownames for to convert
  the row.names attribute to a column.
  This option is inspired by the tibble::as_tibble() function (#561).
• as_polars_df() for data.frame has a new argument make_names_unique (#561).
• New methods $str$to_date(), $str$to_time(), $str$to_datetime() as
  alternatives to $str$strptime() (#558).
• The dim() function for DataFrame and LazyFrame correctly returns integer instead of
  double (#577).
• The conversion of R's POSIXct class to Polars datetime now works correctly with millisecond
  precision (#589).
• <LazyFrame>$filter(), <DataFrame>$filter(), and pl$when() now allow multiple conditions
  to be separated by commas, like lf$filter(pl$col("foo") == 1, pl$col("bar") != 2) (#598).
• New method $replace() for expressions (#601).
• Better error messages for trailing argument commas such as pl$DataFrame()$select("a",) (#607).
• New function pl$threadpool_size() to get the number of threads used by Polars (#620).
  Thread pool size is also included in the output of pl$polars_info().

lib-v0.35.1

docs(website): better display of "Usage" section (#626)

Co-authored-by: eitsupi <ts1s1andn@gmail.com>

v0.11.0

BREAKING CHANGES DUE TO RUST-POLARS UPDATE

• rust-polars is updated to 0.35.0 (2023-11-17) (#515)
  • changes in $write_csv() and sink_csv(): has_header is renamed
    include_header and there's a new argument include_bom.
  • pl$cov() gains a ddof argument.
  • $cumsum(), $cumprod(), $cummin(), $cummax(), $cumcount() are
    renamed $cum_sum(), $cum_prod(), $cum_min(), $cum_max(),
    $cum_count().
  • take() and take_every() are renamed $gather() and gather_every().
  • $shift() and $shift_and_fill() now accept Expr as input.
  • when reverse = TRUE, $arg_sort() now places null values in the first
    positions.
  • Removed argument ambiguous in $dt$truncate() and $dt$round().
  • $str$concat() gains an argument ignore_nulls.

Breaking changes and deprecations

• The rowwise computation when several columns are passed to pl$min(), pl$max(),
  and pl$sum() is deprecated and will be removed in 0.12.0. Passing several
  columns to these functions will now compute the min/max/sum in each column
  separately. Use pl$min_horizontal() pl$max_horizontal(), and
  pl$sum_horizontal() instead for rowwise computation (#508).
• $is_not() is deprecated and will be removed in 0.12.0. Use $not() instead
  (#511, #531).
• $is_first() is deprecated and will be removed in 0.12.0. Use $is_first_distinct()
  instead (#531).
• In pl$concat(), the argument to_supertypes is removed. Use the suffix
  "_relaxed" in the how argument to cast columns to their shared supertypes
  (#523).
• All duration methods (days(), hours(), minutes(), seconds(),
  milliseconds(), microseconds(), nanoseconds()) are renamed, for example
  from $dt$days() to $dt$total_days(). The old usage is deprecated and will
  be removed in 0.12.0.
• DataFrame methods $as_data_frame() is removed in favor of $to_data_frame() (#533).
• GroupBy methods $as_data_frame() and $to_data_frame() which were used to
  convert GroupBy objects to R data frames are removed.
  Use $ungroup() method and the as.data.frame() function instead (#533).

What's changed

• Fix the installation issue on Ubuntu 20.04 (#528, thanks @brownag).
• New methods $write_json() and $write_ndjson() for DataFrame (#502).
• Removed argument name in pl$date_range(), which was deprecated for a while
  (#503).
• New private method .pr$DataFrame$drop_all_in_place(df) to drop DataFrame
  in-place, to release memory without invoking gc(). However, if there are other
  strong references to any of the underlying Series or arrow arrays, that memory
  will specifically not be released. This method is aimed for r-polars extensions,
  and will be kept stable as much as possible (#504).
• New functions pl$min_horizontal(), pl$max_horizontal(), pl$sum_horizontal(),
  pl$all_horizontal(), pl$any_horizontal() (#508).
• New generic functions as_polars_df() and as_polars_lf() to create polars
  DataFrames and LazyFrames (#519).
• New method $ungroup() for GroupBy and LazyGroupBy (#522).
• New method $rolling() to apply an Expr over a rolling window based on
  date/datetime/numeric indices (#470).
• New methods $name$to_lowercase() and $name$to_uppercase() to transform
  variable names (#529).
• New method $is_last_distinct() (#531).
• New methods of the Expressions class, $floor_div(), $mod(), $eq_missing()
  and $neq_missing(). The base R operators %/% and %% for Expressions are
  now translated to $floor_div() and $mod() (#523).
  • Note that $mod() of Polars is different from the R operator %%, which is
    not guaranteed x == (x %% y) + y * (x %/% y).
    Please check the upstream issue pola-rs/polars#10570.
• The extract function ([) for polars objects now behave more like for base R objects (#543).

lib-v0.35.0

docs(news): tweak news (#539)

v0.10.1

What's changed

• The argument quote_style in $write_csv() and $sink_csv() can now take
  the value "never" (#483).
• pl$DataFrame() now errors if the variables specified in schema do not exist
  in the data (#486).
• S3 methods for base R functions are well documented (#494).
• A bug that failing pl$SQLContext()$register() without load the package was fixed (#496).

lib-v0.34.1

docs(NEWS): tweak news about recent updates (#498)

v0.10.0

BREAKING CHANGES DUE TO RUST-POLARS UPDATE

• rust-polars is updated to 2023-10-25 unreleased version (#442)
  • New subnamespace "name" that contains methods $prefix(), $suffix()
keep() (renamed from keep_name()) and map() (renamed from map_alias()).
  • $dt$round() gains an argument ambiguous.
  • The following methods now accept an Expr as input: $top_k(), $bottom_k(),
    $list$join(), $str$strip_chars(), $str$strip_chars_start(),
    $str$strip_chars_end(), $str$split_exact().
  • The following methods were renamed:
    • $str$n_chars() -> $str$len_chars()
    • $str$lengths() -> $str$len_bytes()
    • $str$ljust() -> $str$pad_end()
    • $str$rjust() -> $str$pad_start()
  • $concat() with how = "diagonal" now accepts an argument to_supertypes
    to automatically convert concatenated columns to the same type.
  • pl$enable_string_cache() doesn't take any argument anymore. The string cache
    can now be disabled with pl$disable_string_cache().
  • $scan_parquet() gains an argument hive_partitioning.
  • $meta$tree_format() has a better formatted output.

Breaking changes

• $scan_csv() and $read_csv() now match more closely the Python-Polars API (#455):
  • sep is renamed separator, overwrite_dtypes is renamed dtypes,
    parse_dates is renamed try_parse_dates.
  • new arguments rechunk, eol_char, raise_if_empty, truncate_ragged_lines
  • path can now be a vector of characters indicating several paths to CSV files.
    This only works if all CSV files have the same schema.

What's changed

• New class RPolarsSQLContext and its methods to perform SQL queries on DataFrame-
  like objects. To use this feature, needs to build Rust library with full features
  (#457).
• New methods $peak_min() and $peak_max() to find local minima and maxima in
  an Expr (#462).
• New methods $read_ndjson() and $scan_ndjson() (#471).
• New method $with_context() for LazyFrame to have access to columns from
  other Data/LazyFrames during the computation.

lib-v0.34.0

chore: fix typo and revert Rd file incorrect change (#476)