<!-- NEWS.md is maintained by https://fledge.cynkra.com, contributors should not edit this file -->

# dm 1.1.2

## Bug fixes

- Fix for upcoming dbplyr 2.6.0 release (@hadley, #2454).


# dm 1.1.1

## Bug fixes

- Fix igraph fallback to match igraph behavior for undirected edges and girth (#2424, #2425).

- Remove spurious debugging output.


# dm 1.1.0

## Features

- Aligned with dplyr 1.2.0, all new verbs and arguments are supported.

  ``` r
  dm_nycflights13() |>
    dm_zoom_to(flights) |>
    summarize(.by = origin, mean(dep_delay, na.rm = TRUE))
  ```

- New `dm_flatten()` joins parent tables into a target table in-place and removes
  the now-integrated parents from the dm (#2393, #2394).
  Useful for denormalizing a star schema before reporting or further analysis.
  Supports `recursive`, `allow_deep`, and any dplyr join type.

  ``` r
  dm_nycflights13() |>
    dm_select_tbl(-weather) |>
    dm_flatten(flights, recursive = TRUE)
  ```

- `dm_draw()` gains a `backend_opts` argument that collects all backend-specific
  options in a single named list (#2381).
  The individual top-level arguments (`graph_attrs`, `node_attrs`, `edge_attrs`,
  `focus`, `graph_name`, `font_size`, `columnArrows`) are soft-deprecated in
  favour of passing their equivalents in `backend_opts`.

  ``` r
  dm_nycflights13() |>
    dm_draw(backend_opts = list(column_arrow = FALSE))
  ```

- `dm_examine_constraints()` gains a `.max_value` argument controlling how many
  distinct problematic values are reported in the `problem` column (#2200, #2387).
  The default is `6`; use `.max_value = Inf` to report all violations.

  ``` r
  dm_nycflights13() |>
    dm_examine_constraints(.max_value = Inf)
  ```

- `check_key()` now returns its input data frame when the key is valid
  (#2221, #2303), making it usable in pipelines.

  ``` r
  my_data |>
    check_key(id) |>
    dplyr::filter(value > 0)
  ```

- igraph is now an optional dependency (#2146, #2364), reducing the mandatory
  install footprint.
  Functions that require igraph will prompt you to install it when needed.
  Set `options(dm.use_igraph = FALSE)` to turn off the startup message.

- Keys are now learned automatically from SQLite databases (@gadenbuie, #352).

- Improved duckplyr compatibility.

- `dm_pixarfilms()` now bundles the pixarfilms data directly and gains a `version`
  argument (#2368, #2369).

- All user-facing messages now use `cli::cli_inform()` with native formatting
  (#2374).

## Breaking changes

- A startup message now recommends running `library(dplyr)` before `library(dm)`.
  In a future version, the dm package will no longer reexport all dplyr functions.
  The new pattern ensures that scripts written today will work after that change.
  Set `options(dm.suppress_dplyr_startup_message = TRUE)` to turn off the startup message.

  ``` r
  library(dplyr) # or library(tidyverse)
  library(dm)
  ```

- `copy_dm_to()` now uses `dm_sql()` internally and creates key constraints on the
  database (@krlmlr, #1887, #2022).
  Unique keys and autoincrement primary keys (#1725) are set up automatically.
  Data models with cyclic foreign-key references are now supported on all databases
  that allow `ALTER TABLE` to add constraints (all except DuckDB and SQLite, #664).

  ``` r
  con <- DBI::dbConnect(duckdb::duckdb())
  dm_financial() |>
    copy_dm_to(con, ., temporary = FALSE, set_key_constraints = TRUE)
  DBI::dbDisconnect(con)
  ```

## Bug fixes

- `dm_from_con(learn_keys = TRUE, .names = )` now correctly applies the specified
  table naming pattern (@owenjonesuob, #2213, #2214).

- `dm_from_con()` no longer learns tables from all schemas by default for Postgres,
  MSSQL, and MariaDB (@mgirlich, #1440, #1448).
  The defaults are `"public"` (Postgres), `"dbo"` (MSSQL), and the current
  database (MariaDB), avoiding spurious system tables.

- `dm_rm_fk()` no longer issues a spurious message when foreign keys reference
  non-primary-key columns (#1270, #2367).

- `dm_paste()` limits its pipelines to up to 100 steps, splitting longer pipelines as needed (#2301).


# dm 1.0.12

## Bug fixes

- Improve detection of foreign-key relationships in Postgres (#1879, #2286).

- Avoid including constraints from a different `constraint_schema` when learning from a database (#2228, #2275).

## Features

- Add support for Redshift connections (@owenjonesuob, #2215).

## Chore

- Remove fansi.

- Suggest package used in demo.

- Bump RMariaDB version (#2244).

- Drop crayon and mockr dependencies (@olivroy, #2220).

## Documentation

- Add cynkra ROR (#2282).

- Fix intended links (@guspan-tanadi, #2278).

- Restore empty space removed by styler (#2269).

- Use `index.md`.

- Tweak formatting (@salim-b, #2232).

- Fix typo (@salim-b, #2218).

## Testing

- Stabilize learning tests (#2291).

- Fix compatibility with waldo \>= 0.6.0 (#2240).


# dm 1.0.11

## Features

- Add support for Redshift connections (@owenjonesuob, #2215).

## Chore

- Drop crayon and mockr dependencies (@olivroy, #2220).

## Documentation

- Use `index.md`.

- Tweak formatting (@salim-b, #2232).

- Fix typo (@salim-b, #2218).

## Testing

- Fix compatibility with waldo \>= 0.6.0 (#2240).


# dm 1.0.10

## Chore

- Establish compatibility with igraph \>= 2.0.0 (#2187) and withr 3.0.0 (#2184).

- Reexport `tibble::glimpse()` instead of `pillar::glimpse()` to avoid pillar dependency with roxygen2 7.3.0 (#2179).


# dm 1.0.9

## Features

- `dm_sql()` now processes `table_names` with `dbplyr::escape()`, therefore also accepting dbplyr objects (#2129).

## Chore

- Adapt to DBI \>= 1.2.0 (#2148, #2155).


# dm 1.0.8

## Bug fixes

- `copy_dm_to()` creates string columns of necessary lengths for MariaDB and SQL Server. This worked before for SQL Server in dm 1.0.5, now also works on MariaDB (#311, #2066, #2082).

## Features

- Explicitly fail on `compute(temporary = TRUE)`, which never worked correctly (#2059, #2103).

- Warn about DuckDB not supporting autoincrementing primary keys (#2099).

## Chore

- Make `check_suggested()` a standalone (#2054).

## Documentation

- Tweak vignette for `compute(temporary = TRUE)`.

- Update documentation of `check_suggested()` (@olivroy, #2055).

## Performance

- Speed up `dm()`, `new_dm()`, `as_dm()` and `dm_validate()`. `dm()` and `as_dm()` no longer call `dm_validate()` (#2108).

## Testing

- Add test for `copy_dm_to(table_names = )` (#250, #2101).

- Work around test failures for dbplyr 2.4.0.

- Remove most skips from tests (#2052).


# dm 1.0.7

## Features

- `copy_dm_to()` now warns unconditionally on unsupported arguments, and fails if `copy_to` is provided (#1944). Use the new `dm_sql()` function as a replacement for `copy_dm_to(copy_to = )` (#1915, #2011, @jangorecki).

- New `json_unnest()` and `json_unpack()`, currently implemented for data frames only (#991, #997).

- `dm_rows_append()` also works for local dm, with support for autoincrement primary keys (#1727, #1745).

- Breaking change: Add `check_dots_empty()` calls (#1929, #1943).

- Test MySQL on GHA (#1940).

- Improve MySQL compatibility regarding learning of database schemas and checking of constraints (#1938).

## Breaking changes

- Breaking change: Add `check_dots_empty()` calls (#1929, #1943).

## Bug fixes

- Compatibility with duckdb 0.9.1.

- Minor fixes in `dm_pack_tbl()` and `dm_unwrap_tbl()` (#1947).

## Documentation

- Use `rlang::check_installed()` internally to install missing suggested packages on the fly (@olivroy, #1348, #2036, #2039, #2040).

- Use vectorized `rlang::is_installed()`to decide if examples should be run (@olivroy, #2043).

- Recategorize and describe function reference.

- Better error and information messages when querying keys.

- `collect.zoomed_dm()` shows a more helpful error message (#1929, #1945).

- Add information on default font size to `?dm_draw` (#1935).

- Add `db-*` rules to Makefile to simplify Docker-based database setup.

- Remove curly braces, add `\pkg` (@olivroy, #2042).

## Performance

- Replace `tibble()` by `fast_tibble()` (@mgirlich, #1928).

- Replace superseded `dplyr::recode()` (@mgirlich, #1927).

## Testing

- Remove most skips from tests (#2052).

- Add explicit unique key to `dm_for_filter()`.

- Add Postgres test for `dm_sql()`.

- Switch internal testing to MariaDB.

- Fast offline checks with new `"DM_OFFLINE"` environment variable.

- New GHA checks for the case of missing suggested packages (#1952).

## Chore

- Make `check_suggested()` a standalone (#2054).

- Backport changes from attempted CRAN release (#2046).

- Move magrittr (#1975, #1983), DBI (#1974), and pillar (#1976) to `"Suggests"`.

- Require RMariaDB 1.3.0, work around tidyverse/dbplyr#1190 and tidyverse/dbplyr#1195 (#1989).

## Internal

- Prefer `map*()` over `lapply()` and `vapply()`.

- `styler::style_pkg(scope = "tokens")`.

- Rename internal `new_dm3()` to `dm_from_def()` (#1225, #1949).

- Remove dead code (#979, #1950, #1871).

- Reorganize `build_copy_queries()` (#1923).

- Avoid `dbplyr::ident_q()` (#1788).

- Add ellipsis to `tbl_sum()` signature (#1941).


# dm 1.0.6

## Bug fixes

- Compare version returned by `getRversion()` with string instead of number.

- Work around vctrs bug in jsonlite 1.8.5.

## Features

- `dm_from_con()` gains `.names` argument for pattern-based construction of table names in the dm object (@owenjonesuob, #1790).

- New `dm_set_table_descriptions()`, `dm_get_table_descriptions()` and `dm_reset_table_descriptions()` to set table labels as persistent attributes of the table object (#1888).

- `dm_from_con()` can retrieve multiple schemas, pass a character vector to the `schema` argument (@owenjonesuob, #1533, #1789).

- `build_copy_queries()` and `db_learn_from_db()` improvements (@samssann, #1642, #1677, #1739).

- UK support for `dm_draw()` (#1731, #1877).

- Allow for additional description of tables in dm_draw() (#1875, #1876).

## Chore

- Establish compatibility with dbplyr 2.3.3 and 2.4.0 (@mgirlich, #1919).

- In `copy_dm_to()`, call `collect()` only when copying data, table by table (@jangorecki, #1900).

- Use roxyglobals (#1838).

- Require purrr \>= 1.0.0 for `list_c()` (#1847, #1848).

## Documentation

- Add table description to diagram in README.

- Tweak testing instructions. Mention `Makefile` in CONTRIBUTING.md. Describe Docker setup (#1898).

- Vignette corrections (@MikeJohnPage, #1882).

- Avoid tidyverse package.

## Testing

- Fix local tests (#1921).


# dm 1.0.5

## Features

- Progress bars for `dm_wrap_tbl()` and `dm_unwrap_tbl()` (#835, #1450).

## Documentation

- Add cheat sheet as a vignette (#1653).

- Suggest creating a function for your database `dm` object (#1827, #1828).

- Add alternative text to author images for pkgdown website (#1804).

## Chore

- Compatibility with dev jsonlite (#1837).

- Remove tidyverse dependency (#1798, #1834).

- Minimal patch to fix multiple match updates (@DavisVaughan, #1806).

- Adapt to rlang 1.1.0 changes (#1817).

- Make sure `{dm}` passes "noSuggests" workflow (#1659).


# dm 1.0.4

## Features

- `dm_add_pk()` gains `autoincrement` argument (#1689), autoincrement primary keys are configured on the database with `copy_dm_to()` (#1696).

- New `dm_add_uk()`, `dm_rm_uk()` and `dm_get_all_uks()` functions for explicit support of unique keys (#622, #1716).

- `dm_get_all_pks()` and `dm_get_all_fks()` return output in the order of `table` or `parent_table` argument (#1707).

- Improve error message for `dm_add_pk()` when the `columns` argument is missing (#1644, #1646).

## Breaking changes

- `dm_get_all_pks()`, `dm_get_all_fks()`, and `dm_get_all_uks()` require unquoted table names as input, for consistency with other parts of the API (#1741).

## Bug fixes

- `dm_examine_constraints()` works for `dm` objects on the database with compound keys (#1713).

## Documentation

- Update pkgdown URL to <https://dm.cynkra.com/> (#1652).

- Fix link rot (#1671).

## Internal

- Require dplyr >= 1.1.0 and lifecycle >= 1.0.3 (#1771, #1637).

- Checks pass if all suggested packages are missing (#1659).

- Fix r-devel builds (#1776).

- `dm_unpack_tbl()` sets PK before FK (#1715).

- Clean up `dm_rows_append()` implementation (#1714).

- `dm()` accepts tables that are of class `"tbl_sql"` but not `"tbl_dbi"` (#1695, #1710).

- Use correctly typed missing value for lists (@DavisVaughan, #1686).


# dm 1.0.3

## Chore

- Avoid running example without database connection.


# dm 1.0.2

## Features

- `dm_from_con()` can use multiple schemata (@mgirlich, #1441, #1449).

- `pack_join(keep = TRUE)` preserves order of packed columns (#1513, #1514).

- `pack_join(keep = TRUE)` keeps keys of `y` in the resulting packed column (#1451, #1452).

- New `json_pack.tbl_lazy()` and `json_nest.tbl_lazy()` (#969, #975).

## Bug fixes

- `dm_paste()` gives correct output for factor columns with many levels (#1510, #1511).

## Chore

- Fix compatibility with duckdb 0.5.0 (#1509, #1518).

- Refactor `dm_unwrap_tbl()` so it builds a "unwrap plan" first (#1446, #1447).

- Reenable `dm_rows_update()` test (#1437).


# dm 1.0.1

## Features

- New `dm_deconstruct()` creates code to deconstruct a `dm` object into individual keyed tables via `pull_tbl(keyed = TRUE)` (#1354).

## Bug fixes

- Use `dm_ptype()` in `dm_gui()`, generate better code (#1353).


# dm 1.0.0

## Features

- New `dm_gui()` for interactive editing of `dm` objects (#1076, #1319).

- `dm_get_tables()` and `pull_tbl()` gain a new `keyed = FALSE` argument. If set to `TRUE`, table objects of class `"dm_keyed_tbl"` are returned. These objects inherit from the underlying data structure (tibble or lazy table), keep track of primary and foreign keys, and can be used later on in a call to `dm()` to recreate a dm object with the keys (#1187).

- New `by_position` argument to `check_subset()`, `check_set_equality()`, `check_cardinality_...()` and `examine_cardinality()` (#1253).

- `dm()` accepts dm objects (#1226).

- `dm_examine_constraints()` honors implicit unique keys defined by foreign keys (#1131, #1209).

## Breaking changes

- `dm_filter()` is now stable, with a new API that avoids exposing an intermediate state with filters not yet applied, with a compatibility wrapper (#424, #426, #1236).

- `check_cardinality_...()`, `examine_cardinality()`, `check_subset()` and `check_set_equality()` are now stable and consistently use a common interface with arguments named `x`, `y`, `x_select` and `y_select`, with compatibility wrappers (#1194, #1229).

- `dm_examine_cardinalities()` and `dm_examine_constraints()` are now stable with a new signature and a compatibility wrapper (#1193, #1195).

- `dm_apply_filters()`, `dm_apply_filters_to_tbl()` and `dm_get_filters()` are deprecated (#424, #426, #1236).

- `dm_disambiguate_cols()` adds table names as a suffix by default, and gains a `.position` argument to restore the original behavior. Arguments `sep` and `quiet` are renamed to `.sep` and `.quiet` (#1293, #1327).

- `dm_squash_to_tbl()` is deprecated in favor of the new `.recursive` argument to `dm_flatten_to_tbl()`. Arguments `start` and `join` are renamed to `.start` and `.join` (#1272, #1324).

- `dm_rm_tbl()` is deprecated in favor of `dm_select_tbl()` (#1275).

- `dm_bind()` and `dm_add_tbl()` are deprecated in favor of `dm()` (#1226).

- `rows_truncate()` and `dm_rows_truncate()` are deprecated, because they use DDL as opposed to all other verbs that use DML (#1031, #1321).

- All internal S3 classes now use the `"dm_"` prefix (#1285, #1339).

- Add ellipses to all generics (#1298).

## API

- Reexport `tibble()` (#1279).

- `dm_ptype()`, `dm_financial()` and `dm_pixarfilms()` are stable now (#1254).

- Turn all "questioning" functions to "experimental" (#1030, #1237).

## Performance

- `is_unique_key()`uses `vctrs::vec_count()` on local data frames for speed (@eutwt, #1247).

- `check_key()` uses `vctrs::vec_duplicate_any()` on local data frames for speed (@eutwt, #1234).

## Bug fixes

- `dm_draw()` works if a table name has a space (#1219).

- Don't print rule in `glimpse.dm()` for empty `dm()` (#1208).

## Documentation

- Work around ANSI escape issues in CRAN rendering of vignette (#1156, #1330).

- Fix column names in `?dm_get_all_pks` (#1245).

- Improve contrast for display of `dm_financial()` (#1073, #1250).

- Add contributing guide (#1222).

## Internal

- Use sensible node and edge IDs, corresponding to the data model, in SVG graph (#1214).

- Tests for datamodelr code (#1215).


# dm 0.3.0

## Features

- Implement `glimpse()` for `zoomed_df` (@IndrajeetPatil, #1003, #1161).

- Remove message about automated key selection with the `select` argument in joins on `zoomed_df` (@IndrajeetPatil, #1113, #1176).

- `dm_from_con(learn_keys = TRUE)` works for MariaDB (#1106, #1123, #1169, @maelle), and for compound keys in Postgres (#342, #1006, #1016) and SQL Server (#342).

- New `json_pack_join()`, `json_nest_join()`, `json_pack()` and `json_nest()`, similar to `pack_join()`, `dplyr::nest_join()`, `tidyr::pack()` and `tidyr::nest()`, but create character columns (#917, #918, #973, #974).

- `nest_join()` and `pack_join()` support `zoomed_df` objects (#1119, @IndrajeetPatil).


## API

- Marked stable functions as stable, in particular `dm()` and related functions (#1032, #1040).

- Remove own `rows_*()` implementation for lazy tables, they are now available in dbplyr >= 2.2.0 (#912, #1024, #1028).

- Deprecate `dm_join_to_tbl()`, `dm_is_referenced()` and `dm_get_referencing_tables()` (#1038).

- New `dm_validate()` replaces now deprecated `validate_dm()` (#1033).

- `dm_get_con()` and `dm_get_filters()` use `dm` as argument name (#1034, #1036).

- Mark `...` in `dm_flatten_to_tbl()` as experimental (#1037).

- Add ellipses to `dm_disambiguate_cols()`, `dm_draw()`, `dm_examine_constraints()`, `dm_nycflights13()` and `dm_pixarfilms()` (#1035).

- New `dm_from_con()`, soft-deprecated `dm_from_src()` (#1014, #1018, #1044).

- Moved `pack_join()` arguments past the ellipsis for consistency (#920, #921).


## Bug fixes

- Compatibility fix for writing to SQL Server tables with dbplyr >= 2.2.0.


## Documentation

- The pkgdown site now uses BS5 for greater readability (#1067, @maelle).

- Better message for `dm_rows_...()` functions if the `in_place` argument is missing (@IndrajeetPatil, #414, #1160).

- Better message for learning error (#1081).

- Greatly improved consistency, content, and language across all articles (@IndrajeetPatil, #1056, #1132, #1157, #1166, #1079, #1082, #1098, #1100, #1101, #1103, #1112, #1120, #1158, #1175).

- Tweaks of intro vignette and README (#1066, #1075, @maelle).

- Document `glimpse()` S3 method for `dm` (@IndrajeetPatil, #1121).

- Update credentials to fallback databases for `dm_financial()` hosted on pacha.dev (#916, @pachadotdev), also used now for vignettes (#1118) and in `dm_from_con()` example (#993).

- Update license year (#1029).


## Internal

- Switch to duckdb as default database backend (#1179).

- Test duckdb and MariaDB on GHA (#1091, #1136).


# dm 0.2.8

## Features

- `pack_join()` works correctly if `name` is the same as an existing column in either table. In some cases a column is overwritten, this is consistent with `nest_join()` behavior (#864, #865).
- Messages that suggest the installation of optional packages are shown only once per session (#852).
- `dm_insert_zoomed()` uses the color from the zoomed table for the new table (#750, #863).
- `copy_dm_to()` consumes less memory and is faster when writing to SQL Server (#855).

## Bug fixes

- Remove extra spaces in output when examining constraints with compound keys (#868).
- Fix column tracking for foreign keys (#856, #857).
- `copy_dm_to()` shows progress bars again (#850, #855).
- Progress bars use the console width (#853).
- Avoid calling `dbAppendTable()` for zero-row tables (#847).

## Internal

- Require rlang 1.0.1 (#840).


# dm 0.2.7

## Features

- New `dm_wrap_tbl()`, `dm_unwrap_tbl()`, `dm_nest_tbl()`, `dm_unnest_tbl()`, `dm_pack_tbl()` and `dm_unpack_tbl()` (#595, #733, #737).
- New `dm_examine_cardinality()` (#264, #735).
- New `pack_join()` generic and method for data frames, the same to `tidyr::pack()` as `dplyr::nest_join()` is to `tidyr::nest()` (#721, #722).
- `dm_pixarfilms()` is exported and gains a `consistent = FALSE` argument; if `TRUE` the data is modified so that all referential constraints are satisfied (#703, #707, #708, @erictleung).

## Bug fixes

- `db_schema_...()` functions no longer pro-actively check for schema existence (#672, #815, #771).
- `db_schema_list.Microsoft SQL Server` no longer ignoring schemas for which the owner cannot be found (#815, #771).
- `copy_dm_to()` works with DuckDB again, the SQL statements to define the tables and indexes are now created by us (#701, #709).

## Internal

- Establish compatibility with rlang 1.0.0 (#756).
- Simplify database checks on GitHub Actions (#712).


# dm 0.2.6

## Features

- New `dm_pixarfilms()` creates a dm object with data from the {pixarfilms} package (#600, @erictleung).
- `check_cardinality_0_1()`, `check_cardinality_0_n()`, `check_cardinality_1_1()`, `check_cardinality_1_n()`, and `examine_cardinality()` now support compound keys (#524).
- `check_subset()` and `check_set_equality()` support compound keys (#523).
- `dm_paste()` adds the `on_delete` argument to `dm_add_fk()` (#673).
- `dm_disambiguate_cols()` also disambiguates columns used in keys, to support correct disambiguation for compound keys  (#662).
- `dm_disambiguate_cols()` now emits the source code equivalent of a renaming operation (#684).
- `dm_examine_constraints()` uses backticks to surround table names (#687).

## Bug fixes

- `decompose_table()` now avoids creating `NA` values in the key column (#580).
- `dm_draw()` works with empty tables (#585).

## Internal

- Fix compatibility with dplyr 1.0.8 (#698).


# dm 0.2.5

## Features

- `mutate()`, `transmute()`, `distinct()` and `summarize()` now support `dplyr::across()` and extra arguments (#640).
- Key tracking for the first three verbs is less strict and based on name equality (#663).
- `relocate()` now works on zoomed `dm` objects (#666).
- `dm_add_fk()` gains `on_delete` argument which `copy_dm_to()` picks up and translates to an `ON DELETE CASCADE` or `ON DELETE NO ACTION` specification for the foreign key (#649).
- `dm_copy_to()` defines foreign keys during table creation, for all databases except DuckDB. Tables are created in topological order (#658). For cyclic relationship graphs, table creation is attempted in the original order and may fail (#664).
- `waldo::compare()` shows better output for dm objects (#642).
- `dm_paste()` output uses trailing commas in the `dm::dm()` and `tibble::tibble()` calls, and sorts column attributes by name, for better modularity (#641).

## Breaking changes

- New `db_schema_create()`, `db_schema_drop()`, `db_schema_exists()` and `db_schema_list()` replace the corresponding `sql_schema_*()` functions, the latter are soft-deprecated (#670). The connection argument to `db_schema_*()` is called `con`, not `dest` (#668).

## Bug fixes

- `copy_dm_to()` and `sql_create_schema()` no longer actively check for schema existence (#644, #660).
- Add newline after `OUTPUT` clause for SQL Server (#647).
- Fix `sql_rows_delete()` with `returning` argument for SQL Server (#645).

## Internal

- Remove method only needed for RSQLite < 2.2.8, add warning if loaded RSQLite version is <= 2.2.8 (#632).
- Adapt MSSQL tests to testthat update (#648).


# dm 0.2.4

## Features

- `rows_insert()`, `rows_update()` and `rows_delete()` gain `returning` argument. In combination with `in_place = TRUE` this argument makes the newly inserted rows accessible via `get_returning_rows()` after the operation completes (#593, @mgirlich).
- Implement `rows_patch()` for DBI connections (#610, @mgirlich).
- Use `NO ACTION` instead of `CASCADE` in foreign key constraints to permit self-references.
- `dm_from_src()` supports `pool::Pool` objects (#599, @moodymudskipper).
- Better error message for `dm_rows_update()` and related functions for dm objects with tables without primary key (#592).
- `glimpse()` is implemented for `dm` objects (#605).
- Support DuckDB in `rows_insert()`, `rows_update()` and `rows_delete()` (#617, @mgirlich).

## Bug fixes

- Fix `dm_zoom_to()` for `dm` objects with an empty table (#626, @moodymudskipper).
- Avoid generating invalid `dm` objects in some corner cases (#596).

## Internal

- `sql_schema_list()` supports `pool::Pool` objects (#633, @brancengregory).
- Establish compatibility with pillar 1.6.2, vctrs > 0.3.8 and rlang > 0.4.11 (#613).
- Use `check_suggested()` everywhere (#572, @moodymudskipper).
- Add CI run for validating all new `dm` objects (#597).


# dm 0.2.3

## Bug fixes

- Fix `rows_truncate()` in interactive mode (#588).

## Features

- Implement `rows_delete()` for databases (#589).

## Internal

- Skip examples that might require internet access on non-CI platforms.


# dm 0.2.2

## Features

- `dm_examine_constraints()`, `dm_rows_insert()` and related, `copy_dm_to()` and `collect.dm()` show progress bars in interactive mode via the progress package. The new `progress = NA` argument controls the behavior (#262, @moodymudskipper).
- `copy_dm_to()` gains a `copy_to` argument to support other ways of copying data to the database (#582).

## Internal

- Always run database tests on sqlite for df source.
- Establish compatibility with testthat > 3.0.2 (#566, @moodymudskipper).


# dm 0.2.1

## Breaking changes

- `dm_get_all_fks()` returns a data frame with a  `parent_key_cols` instead of a `parent_pk_cols` column (introduced in dm 0.2.0), to reflect the fact that a foreign key no longer necessarily points to a primary key (#562).
- `*_pk()` and `*_fk()` functions now verify that the dots are actually empty (#536).
- `dm_get_pk()` is deprecated in favor of `dm_get_all_pks()` (#561).
- `dm_has_fk()` and `dm_get_fk()` are deprecated in favor of `dm_get_all_fks()` (#561).

## Features

- `dm_add_fk()` gains `ref_columns` argument that supports creating foreign keys to non-primary keys (#402).
- `dm_get_all_pks()` gains `table` argument for filtering the returned primary keys (#560).
- `dm_get_all_fks()` gains `parent_table` argument for filtering the returned foreign keys (#560).
- `dm_rm_fk()` gains an optional `ref_columns` argument. This function now supports removal of multiple foreign keys filtered by parent or child table or columns, with a message (#559).
- `dm_rm_pk()` gains `columns` argument and allows filtering by columns and by tables or removing all primary keys. The `rm_referencing_fks` argument has been deprecated in favor of the new `fail_fk` argument (#558).
- `dm_get_all_fks()` has been optimized for speed and no longer sorts the keys (#560).
- dm operations are now slightly faster overall.

## Internal

- The internal data structure for a dm object has changed to accommodate foreign keys to other columns than the primary key. An upgrade message is shown when working with a dm object from an earlier version, e.g. if it was loaded from a cache or an `.rds` file (#402).
- Drop `"dm_v1"` class from dm objects again, this would have made every S3 dispatch more costly. Relying on an internal `"version"` attribute instead (#547).


# dm 0.2.0

## Breaking changes

- Deprecate `dm_get_src()` `tbl.dm()`, `src_tbls.dm()`, `copy_to.dm()`. These functions have better alternatives and use the notion of a "data source" which is being phased out of dplyr (#527).
- `*_pk()` and `*_fk()` functions gain an ellipsis argument that comes before `check`, `force` and `rm_referencing_fks` arguments (#520).

## Features

- `dm_add_pk()` and `dm_add_fk()` support compound keys via the `c()` notation, e.g. `dm_add_pk(dm, table, c(col1, col2))`. `dm_nycflights13()` returns a data model with compound keys by default. Use `compound = FALSE` to return the data model from dm v0.1.13 or earlier (#3).
- `dm_get_all_fks()` includes `parent_pk_cols` column that describes the primary key columns of the parent table (#335).
- `dm_from_src()` supports the `schema` argument also for MariaDB and MySQL databases (#516).
- dm objects now inherit from `"dm_v1"` in addition to `"dm"`, to allow backward-compatible changes of the internal format (#521).
- Use hack to create compound primary keys on the database (#522).
- `dm_examine_constraints()` and other check functions count the number of rows that violate constraints for primary and foreign keys (#335).
- `copy_dm_to(set_key_constraints = FALSE)` downgrades unique indexes to regular indexes (#335).
- `rows_truncate()` implemented for data frames (#335).
- `dm_enum_fk_candidates()` enumerates column in the order they apper in the table (#335).

# dm 0.1.13

## Features

- `dm_draw()` gains `column_types` argument, if `TRUE` the column type is shown for each displayed column (#444, @samssann).
- `copy_dm_to()` gains `schema` argument (#432).
- `dm_from_src()` gains `dbname` argument for MSSQL (#472).

## Bug fixes

- Fix `rows_update()` when multiple columns are updated (#488, @samssann).

## Performance

- `enum_fk_candidates()` now only checks distinct values, this improves performance for large tables. As a consequence, only the number of distinct values is reported for mismatches, not the number of mismatching rows/entries (#494).

## Documentation

- Fix description of filtering behavior in `?dm_zoom_to` (#403).

## Internal

- Move repository to <https://github.com/cynkra/dm> (#500).
- Enable more Postgres tests (#497).
- Test DuckDB on GitHub Actions (#498).


# dm 0.1.12

- `dm_from_src()` gains `dbname` argument for MSSQL (#472).
- Implement `count()` and `tally()` for dplyr 1.0.3 compatibility (#475).
- Use databases.pacha.dev instead of db-edu.pacha.dev (#478, @pachamaltese).


# dm 0.1.10

- Columns with missing values are no longer primary keys (#469).
- Fix `dm_from_src()` for MSSQL when `learn_keys = FALSE` (#427).
- Tests use `expect_snapshot()` everywhere (#456).
- Fix compatibility with testthat 3.0.1 (#457).


# dm 0.1.9

- New `vignette("howto-dm-copy", package = "dm")` and `vignette("howto-dm-rows", package = "dm")` discuss updating data on the database. In part derived from `vignette("howto-dm-db", package = "dm")` (#411, @jawond).
- New `dm_mutate_tbl()` (#448).
- `dm_financial()` falls back to db-edu.pacha.dev if relational.fit.cvut.cz is unavailable (#446, @pachamaltese).
- Use testthat 3e (#455).


# dm 0.1.7

- Bump RMariaDB required version to 1.0.10 to work around timeout with `R CMD check`.
- `dm_from_src()` accepts `schema` argument for MSSQL databases (#367).


# dm 0.1.6

## Breaking changes

- `dm_get_src()` returns `NULL` for local data sources (#394).
- Local target in `copy_dm_to()` gives a deprecation message (#395).

## Features

- `copy_dm_to()` gives a better error message for bad `table_names` (#397).
- `dm` objects with local data sources no longer show the "Table source" part in the output.
- Error messages now refer to "tables", not "elements" (#413).
- New `dm_bind()` for binding two or more 'dm' objects together (#417).

## Bug fixes

- For databases, the underlying SQL table names are quoted early to avoid later SQL syntax errors (#419).
- `dm_financial()` no longer prints message about `learn_keys = FALSE`.
- `dm_rows_update()` and related functions now use the primary keys defined in `x` for establishing matching rows.

## Internal

- Use `withCallingHandlers()` where appropriate (#422).
- Consistent definition of `.dm` and `.dm_zoomed` methods (#300).
- Examples involving `dm_financial()` are not run if connection can't be established (#418).
- Fix database tests on CI (#416).


# dm 0.1.5

## Features

- `dm_paste()` generates self-contained code (#401).
- Errors regarding cycles in the relationship graph now show the shortest cycle (#405).
- Implement `rows_truncate()` for databases.
- `collect()` works on a zoomed dm, with a message.
- The data model is drawn in a more compact way if it comprises of multiple connected components.
- `dm_add_pk(check = TRUE)` gives a better error message.

## Bug fixes

- `rows_insert()` works if column names consist of SQL keywords (#409).
- Cycles in other connected components don't affect filtering in a cycle-free component.
- Avoid `src_sqlite()` in examples (#372).

## Internal

- Testing SQLite, Postgres and SQL Server on GitHub Actions (#408, @pat-s).
- Testing packages with all "Suggests" uninstalled.


# dm 0.1.4

## Features

- New `dm_rows_insert()`, `dm_rows_update()`, `dm_rows_patch()`, `dm_rows_upsert()`, `dm_rows_delete()` and `dm_rows_truncate()`, calling the corresponding `rows_*()` method for every table (#319).

- New `rows_truncate()` (#319).

- Added `rows_insert()` and `rows_update()` methods for SQLite, Postgres, MariaDB and MSSQL (#319).

- Missing arguments now give a better error message (#388).

- Empty `dm` object prints as `dm()` (#386).

- `copy_dm_to()` also accepts a function as the `table_names` argument. The `unique_table_names()` argument is deprecated (#80).

## Documentation

- Add TL;DR to README (#377, @jawond).

- Add content from old README to `howto-dm-theory.Rmd` (#378, @jawond).

## Internal

- Require dplyr >= 1.0.0.

- Use GitHub Actions (#369, @pat-s).


# dm 0.1.3

- Avoid `src_sqlite()` in vignettes (#372).
- Rename vignettes (#349).
- Rename error class `"dm_error_tables_not_neighbours"` to `"dm_error_tables_not_neighbors"`.
- Shortened README and intro article (#192, @jawond).
- Better testing for MSSQL (#339).
- Fix compatibility with dplyr 1.0.0.


# dm 0.1.2

## Features

- `dm_from_src()` now works for databases other than Postgres and MSSQL (#288), gives a warning if tables cannot be accessed with `table_name = NULL` (#348), and gains `learn_keys` argument to control querying of primary and foreign keys from the database (#340).
- `dm_examine_constraints()` now prints a different message if a dm has no constraints defined.
- Disambiguation message now only lists column names for easier copy-pasting.
- New methods for `"dm_zoomed"`: `head()`, `tail()`, `pull()`, `group_data()`, `group_indices()`, `group_vars()`, `group_keys()` and `groups()` (#236, #203).
- `dm_paste()` supports writing colors and the table definition via the new `options` argument. The definition can be written to a file via the new `path` argument. The `select` argument is soft-deprecated (#218, #302).
- `dm_add_tbl()` uses `rlang::list2()` internally, now accepts `:=` to specify table names.
- New `dm_ptype()` (#301).
- New `dm_financial()` and `dm_financial_sqlite()`.
- Printing dm objects from database sources with many tables is now faster (#308, @gadenbuie).
- `check_key()` now also works on a zoomed dm.
- Key columns are always selected in a join operation, with a message (#153).
- Support alpha colors for the table colors (#279).


## Bug fixes

- Fix visualization of column that acts as a foreign key more than once (#37).
- `dm_add_pk()`, `dm_rm_pk()`, `dm_add_fk()` and `dm_rm_fk()` are now stricter when keys exists or when attempting to remove keys that don't exist. A more relaxed mode of operation may be added later (#214).
- `examine_cardinality()`, `dm_examine_constraints()` and `enum_pk_candidates()` now work for columns named `n`.
- `dm_set_key_constraints()` (and by extension `dm_copy_to(set_key_constraints = TRUE)`) now quote identifiers for the SQL that creates foreign keys on the database.
- `collect()` gives a better error message when called on a `"dm_zoomed"` (#294).
- `check_subset()` gives a clean error message if the tables are complex expressions.
- `dm_from_src(schema = "...")` works on Postgres if `search_path` is not set on the connection.
- `compute.dm_zoomed()` no longer throws an error.
- Remove unused DT import (#295).


## Compatibility

- Remove use of deprecated `src_df()` (#336).
- Fix compatibility with dplyr 1.0.0 (#203).


## Documentation

- `dm_draw()` output is shown in examples (#251).
- New article "{dm} and databases" (#309, @jawond).


## Internal

- Testing on local data frames (by default), optionally also SQLite, Postgres, RMariaDB, and SQL Server. Currently requires development versions and various pull requests (#334, #327, #312, #76).
- `dm_nycflights13(subset = TRUE)` memoizes subset and also reduces the size of the `weather` table.
- Expand definitions of deprecated functions (#204).


# dm 0.1.1

- Implement `format.dm()`.
- Adapt to tidyselect 1.0.0 (#257).
- Zooming and unzooming is now faster if no columns are removed.
- Table names must be unique.
- `dm_examine_constraints()` formats the problems nicely.
- New class for prettier printing of keys (#244).
- Add experimental schema support for `dm_from_src()` for Postgres through the new `schema` and `table_type` arguments (#256).


# dm 0.1.0

- Package is now in the "maturing" lifecycle (#154).
- `filter.dm_zoomed()` no longer sets the filter.
- `examine_()` functions never throw an error (#238).
- API overhaul: `dm_zoom_to()`, `dm_insert_zoomed()`, `dm_update_zoomed()` and `dm_discard_zoomed()`; `check_()` -> `examine_()`; `dm_get_filter()` -> `dm_get_filters()`; `dm_from_src()` + `dm_learn_from_db()` -> `dm_from_src()` (#233).
- New `$.dm_zoomed()`, `[.dm_zoomed()`, `[[.dm_zoomed()`, `length.dm_zoomed()`, `names.dm_zoomed()`, `tbl_vars.dm_zoomed()` (#199, #216).
- New `as.list()` methods (#213).
- Help pages for dplyr methods (#209).
- New migration guide from dm <= 0.0.5 (#234).
- New {tidyselect} interface for setting colors (#162) and support for hex color codes as well as R standard colors.
- Prepare `dm_examine_constraints()` and other key-related functions for compound keys (#239).
- Avoid warnings in `R CMD check` with dev versions of dependencies.
- Improve error messages for missing tables (#220).


# dm 0.0.6

- Change `cdm_` prefix to `dm_`. The old names are still available (#117).
- New `pull_tbl()` extracts a single table from a `dm` (#206).
- New `dm_apply_filters_to_tbl()` that applies filters in related tables to a table, similar to `dm_apply_filters()`; `tbl()`, `$` and `[[` no longer apply filter conditions defined in related tables (#161).
- New `dm_paste()` (#160).
- New `check_cardinality()` returns the nature of the relationship between `parent_table$pk_col` and `child_table$fk_col` (#15).
- New zoom vignette (#171).
- `check_key()` no longer maps empty selection list to all columns.
- `check_key()` supports tidyselect (#188).
- `dm_rm_tbl()` supports tidyselect (#127).
- `decompose_table()` uses tidyselect (#194).
- Implement `copy_to()` for `dm` objects (#129).
- Relax test for cycles in relationship graph (#198).
- Return `ref_table` column in `dm_check_constraints()` (#178).
- `str()` shows simplified views (#123).
- Edits to README (#172, @bbecane).
- Extend `validate_dm()` (#173).
- Fix zooming into table that uses an FK column as primary key (#193).
- Fix corner case in `dm_rm_fk()` (#175).
- More efficient `check_key()` for databases (#208).
- Testing for R >= 3.3 and for debug versions.
- Remove {stringr} dependency (#183).


# dm 0.0.5

## Features

- `cdm_filter()` and `filter.dm_zoomed()` apply the filter instantly, the expression is recorded only for display purposes and for terminating the search for filtered tables in `cdm_apply_filters()`. This now allows using a variety of operations on filtered `dm` objects (#124).
- `dimnames()`, `colnames()`, `dim()`, `distinct()`, `arrange()`, `slice()`, `separate()` and `unite()` implemented for zoomed dm-s (#130).
- Joins on zoomed dm objects now supported (#121). Joins use the same column name disambiguation algorithm as `cdm_flatten_to_tbl()` (#147).
- `slice.dm_zoomed()`: user decides in arg `.keep_pk` if PK column is tracked or not (#152).
- Supported {dplyr} and {tidyr} verbs are reexported.
- `enum_pk_candidates()` works with zoomed dm-s (#156).
- New `enum_fk_candidates()` (#156).
- Add name repair argument for both `cdm_insert_zoomed_tbl()` and `cdm_add_tbl()`, defaulting to renaming of old and new tables when adding tables with duplicate names (#132).
- Redesign constructors and validators: `dm()` is akin to `tibble()`, `dm_from_src()` works like `dm()` did previously, `new_dm()` only accepts a list of tables and no longer validates, `validate_dm()` checks internal consistency (#69).
- `compute.dm()` applies filters and calls `compute()` on all tables (#135).

## Documentation

- New demo.
- Add explanation for empty `dm` (#100).

## Bug fixes

- Avoid asterisk when printing local `dm_zoomed` (#131).
- `cdm_select_tbl()` works again when multiple foreign keys are defined between two tables (#122).


# dm 0.0.4

- Many {dplyr} verbs now work on tables in a `dm`. Zooming to a table vie `cdm_zoom_to_tbl()` creates a zoomed `dm` on which the {dplyr} verbs can be applied. The resulting table can be put back into the `dm` with `cdm_update_zoomed_tbl()` (overwriting the original table) or `cdm_insert_zoomed_tbl()` (creating a new table), respectively (#89).
- `cdm_select_to_tbl()` removes foreign key constraints if the corresponding columns are removed.
- Integrate code from {datamodelr} in this package (@bergant, #111).
- Reorder tables in `"dm"` using `cdm_select_tbl()` (#108).
- More accurate documentation of filtering operation (#98).
- Support empty `dm` objects via `dm()` and `new_dm()` (#96).
- `cdm_flatten_to_tbl()` now flattens all immediate neighbors by default (#95).
- New `cdm_add_tbl()` and `cdm_rm_tbl()` (#90).
- New `cdm_get_con()` (#84).
- A `dm` object is defined using a nested tibble, one row per table (#57).


# dm 0.0.3

- `cdm_enum_pk_candidates()` and `cdm_enum_fk_candidates()` both show candidates first (#85).
- `cdm_flatten_to_tbl()` works only in the immediate neighborhood (#75).
- New `cdm_squash_to_tbl()` implements recursive flattening for left, inner and full join (#75).
- Updated readme and introduction vignette (#72, @cutterkom).
- New `cdm_check_constraints()` to check referential integrity of a `dm` (#56).
- `cdm_copy_to()` gains `table_names` argument (#79).
- `check_key()` now deals correctly with named column lists (#83).
- Improve error message when calling `cdm_add_pk()` with a missing column.


# dm 0.0.2.9003

- Fix `R CMD check`.


# dm 0.0.2.9002

- Use caching to improve loading times.
- Run some tests only for one source (#76).
- `cdm_enum_fk_candidates()` checks for class compatibility implicitly via `left_join()`.
- `cdm_enum_fk_candidates()` contains a more detailed entry in column why if no error & no candidate (percentage of mismatched vals etc.).
- Improve error messages for `cdm_join_to_tbl()` and `cdm_flatten_to_tbl()` in the presence of cycles or disconnected tables (#74).


# dm 0.0.2.9001

- Remove the `src` component from dm (#38).
- Internal: Add function checking if all tables have same src.
- Internal: Add 2 classed errors.
- `cdm_get_src()` for local dm always returns a src based on `.GlobalEnv`.
- `cdm_flatten()` gains `...` argument to specify which tables to include. Currently, all tables must form a connected subtree rooted at `start`. Disambiguation of column names now happens after selecting relevant tables. The resulting SQL query is more efficient for inner and outer joins if filtering is applied. Flattening with a `right_join` with more than two tables is not well-defined and gives an error (#62).
- Add a vignette for joining functions (#60, @cutterkom).
- Shorten message in `cdm_disambiguate_cols()`.


# dm 0.0.2.9000

- `cdm_flatten_to_tbl()` disambiguates only the necessary columns.
- When flattening, the column name of the LHS (child) table is used (#52).
- Fix formatting in `enum_pk_candidates()` for character data.
- `cdm_add_pk()` and `cdm_add_fk()` no longer check data integrity by default.
- Explicitly checking that the `join` argument is a function, to avoid surprises when the caller passes data.
- `cdm_copy_to()` works correctly with filtered `dm` objects.
- `cdm_apply_filters()` actually resets the filter conditions.
- A more detailed README file and a vignette for filtering (#29, @cutterkom).
- `cdm_draw()` no longer supports the `table_names` argument, use `cdm_select_tbl()`.
- Copying a `dm` to a database now creates indexes for all primary and foreign keys.


# dm 0.0.2

## Breaking changes

- Requires tidyr >= 1.0.0.
- `cdm_nrow()` returns named list (#49).
- Remove `cdm_semi_join()`.
- Remove `cdm_find_conn_tbls()` and the `all_connected` argument to `cdm_select()` (#35).
- Unexport `cdm_set_key_constraints()`.
- Rename `cdm_select()` to `cdm_select_tbl()`, now uses {tidyselect}.
- `cdm_nycflights13()` now has `cycle = FALSE` as default.
- Rename `cdm_check_for_*()` to `cdm_enum_*()`.

## Performance

- `cdm_filter()` only records the filtering operation, the filter is applied only when querying a table via `tbl()` or when calling `compute()` or the new `cdm_apply_filters()` (#32).

## New functions

- New `cdm_flatten_to_tbl()` flattens a `dm` to a wide table with starting from a specified table (#13). Rename `cdm_join_tbl()` to `cdm_join_to_tbl()`.
- New `cdm_disambiguate_cols()` (#40).
- New `cdm_rename()` (#41) and `cdm_select()` (#50) for renaming and selecting columns of `dm` tables.
- New `length.dm()` and `length<-.dm()` (#53).
- `$`, `[[`, `[`, `names()`, `str()` and `length()` now implemented for dm objects (read-only).
- New `enum_pk_candidates()`.

## Minor changes

- `browse_docs()` opens the pkgdown website (#36).
- `as_dm()` now also accepts a list of remote tables (#30).
- Use {tidyselect} syntax for `cdm_rename_tbl()` and `cdm_select_tbl()` (#14).
- The tibbles returned by `cdm_enum_fk_candidates()` and `cdm_enum_pk_candidates()` contain a `why` column that explains the reasons for rejection in a human-readable form (#12).
- Improve compatibility with RPostgres.
- `create_graph_from_dm()` no longer fails in the presence of cycles (#10).
- Only suggest {RSQLite}.
- `cdm_filter()` no longer requires a primary key.
- `decompose_table()` adds the new column in the table to the end.
- `tbl()` now fails if the table is not part of the data model.

## Documentation

- Add setup article (#7).

## Internal

- Using simpler internal data structure to store primary and foreign key relations (#26).
- New `nse_function()` replaces `h()` for marking functions as NSE to avoid R CMD check warnings.
- Simplified internal data structure so that creation of new operations that update a dm becomes easier.
- When copying a dm to a database, `NOT NULL` constraints are set at creation of the table. This removes the necessity to store column types.
- Using {RPostgres} instead of {RPostgreSQL} for testing.


# dm 0.0.1

Initial GitHub release.

## Creating `dm` objects and basic functions:

- `dm()`
- `new_dm()`
- `validate_dm()`
- `cdm_get_src()`
- `cdm_get_tables()`
- `cdm_get_data_model()`
- `is_dm()`
- `as_dm()`

## Primary keys

- `cdm_add_pk()`
- `cdm_has_pk()`
- `cdm_get_pk()`
- `cdm_get_all_pks()`
- `cdm_rm_pk()`
- `cdm_check_for_pk_candidates()`

## Foreign keys

- `cdm_add_fk()`
- `cdm_has_fk()`
- `cdm_get_fk()`
- `cdm_get_all_fks()`
- `cdm_rm_fk()`
- `cdm_check_for_fk_candidates()`

## Visualization

- `cdm_draw()`
- `cdm_set_colors()`
- `cdm_get_colors()`
- `cdm_get_available_colors()`

## Flattening

- `cdm_join_tbl()`

## Filtering

- `cdm_filter()`
- `cdm_semi_join()`
- `cdm_nrow()`

## Interaction with DBs

- `cdm_copy_to()`
- `cdm_set_key_constraints()`
- `cdm_learn_from_db()`

## Utilizing foreign key relations

- `cdm_is_referenced()`
- `cdm_get_referencing_tables()`
- `cdm_select()`
- `cdm_find_conn_tbls()`

## Table surgery

- `decompose_table()`
- `reunite_parent_child()`
- `reunite_parent_child_from_list()`

## Check keys and cardinalities

- `check_key()`
- `check_if_subset()`
- `check_set_equality()`
- `check_cardinality_0_n()`
- `check_cardinality_1_n()`
- `check_cardinality_1_1()`
- `check_cardinality_0_1()`

## Miscellaneous

- `cdm_nycflights13()`
- `cdm_rename_table()`
- `cdm_rename_tables()`
