[R] Simplify dataset and table print output #38916
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### Rationale for this change When printing objects with data with lots of rows, the output is long and unwieldy. ### What changes are included in this PR? * Truncates long schema print output and adds the number of columns to dataset print output. * Add number of columns to output so it's clear how many there are in total ### Are these changes tested? Yes ### Are there any user-facing changes? Yes Before: ``` r library(arrow) x <- tibble::tibble(!!!letters, .rows = 5) InMemoryDataset$create(x) #> InMemoryDataset #> "a": string #> "b": string #> "c": string #> "d": string #> "e": string #> "f": string #> "g": string #> "h": string #> "i": string #> "j": string #> "k": string #> "l": string #> "m": string #> "n": string #> "o": string #> "p": string #> "q": string #> "r": string #> "s": string #> "t": string #> "u": string #> "v": string #> "w": string #> "x": string #> "y": string #> "z": string arrow_table(x) #> Table #> 5 rows x 26 columns #> $"a" <string> #> $"b" <string> #> $"c" <string> #> $"d" <string> #> $"e" <string> #> $"f" <string> #> $"g" <string> #> $"h" <string> #> $"i" <string> #> $"j" <string> #> $"k" <string> #> $"l" <string> #> $"m" <string> #> $"n" <string> #> $"o" <string> #> $"p" <string> #> $"q" <string> #> $"r" <string> #> $"s" <string> #> $"t" <string> #> $"u" <string> #> $"v" <string> #> $"w" <string> #> $"x" <string> #> $"y" <string> #> $"z" <string> record_batch(x) #> RecordBatch #> 5 rows x 26 columns #> $"a" <string> #> $"b" <string> #> $"c" <string> #> $"d" <string> #> $"e" <string> #> $"f" <string> #> $"g" <string> #> $"h" <string> #> $"i" <string> #> $"j" <string> #> $"k" <string> #> $"l" <string> #> $"m" <string> #> $"n" <string> #> $"o" <string> #> $"p" <string> #> $"q" <string> #> $"r" <string> #> $"s" <string> #> $"t" <string> #> $"u" <string> #> $"v" <string> #> $"w" <string> #> $"x" <string> #> $"y" <string> #> $"z" <string> ``` After: ``` r library(arrow) x <- tibble::tibble(!!!letters, .rows = 5) InMemoryDataset$create(x) #> InMemoryDataset #> 26 columns #> "a": string #> "b": string #> "c": string #> "d": string #> "e": string #> "f": string #> "g": string #> "h": string #> "i": string #> "j": string #> "k": string #> "l": string #> "m": string #> "n": string #> "o": string #> "p": string #> "q": string #> "r": string #> "s": string #> "t": string #> ... #> Use `schema()` to see entire schema arrow_table(x) #> Table #> 5 rows x 26 columns #> $"a" <string> #> $"b" <string> #> $"c" <string> #> $"d" <string> #> $"e" <string> #> $"f" <string> #> $"g" <string> #> $"h" <string> #> $"i" <string> #> $"j" <string> #> $"k" <string> #> $"l" <string> #> $"m" <string> #> $"n" <string> #> $"o" <string> #> $"p" <string> #> $"q" <string> #> $"r" <string> #> $"s" <string> #> $"t" <string> #> ... #> Use `schema()` to see entire schema record_batch(x) #> RecordBatch #> 5 rows x 26 columns #> $"a" <string> #> $"b" <string> #> $"c" <string> #> $"d" <string> #> $"e" <string> #> $"f" <string> #> $"g" <string> #> $"h" <string> #> $"i" <string> #> $"j" <string> #> $"k" <string> #> $"l" <string> #> $"m" <string> #> $"n" <string> #> $"o" <string> #> $"p" <string> #> $"q" <string> #> $"r" <string> #> $"s" <string> #> $"t" <string> #> ... #> Use `schema()` to see entire schema ``` * Closes: #38916 Lead-authored-by: Nic Crane <thisisnic@gmail.com> Co-authored-by: Bryce Mecum <petridish@gmail.com> Signed-off-by: Nic Crane <thisisnic@gmail.com>
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Describe the enhancement requested
When we print a dataset, we get a short description of the dataset and then the full schema with one column on each line. This looks fine for datasets with few columns, but can grow unwieldy and messy. An example from a recent dataset I've been working with:
We could do something like the tibble preview, with instructions to call
schema()to view the full schema. The tibble preview for the dataset, for contrast:Component(s)
R
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