emilk opened a new pull request, #8290:
URL: https://github.com/apache/arrow-rs/pull/8290
# Which issue does this PR close?
- Closes #7048
- Continues and closes #7051
# Rationale for this change
DataType:s are often shown in error messages, both using `Display` and
`Debug`. Making these error messages readable is _very important_.
# What changes are included in this PR?
Improve `Display` and `Debug` formatting of:
* `DataType::List`
* `DataType::LargeList`
* `DataType::FixedSizeList`
# Are these changes tested?
Yes - new tests cover them
# Are there any user-facing changes?
Yes! Formatting is MUCH improved:
**Before**: `List(Field { name: \"item\", data_type: Int32, nullable: true,
dict_id: 0, dict_is_ordered: false, metadata: {} })`
**After**: `List(nullable Int32)`
**Before**: `FixedSizeList(Field { name: \"item\", data_type: Int32,
nullable: false, dict_id: 0, dict_is_ordered: false, metadata: {} }, 5)`
**After**: `FixedSizeList(5 x Int32)`
Care has been taken that the formatting is reversible, though the actual
`FromStr` implementation is still not written (it is missing on `main`, and
missing in this PR - so no change).
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