aokolnychyi opened a new pull request #1373:
URL: https://github.com/apache/iceberg/pull/1373
This WIP PR extends Iceberg metadata with a sort order and is supposed to
replace the work in #589.
The API currently looks like this:
```
SortOrder.builderFor(schema)
.withOrderId(3)
.asc("y", NullOrder.NULLS_FIRST)
.desc(Expressions.bucket("z", 4), NullOrder.NULLS_LAST)
.build();
```
The underlying representation looks like this:
```
"default-sort-order-id": 3,
"sort-orders": [
{
"order-id": 3,
"fields": [
{
"transform": "identity",
"source-id": 2,
"direction": "asc",
"null-order": "first"
},
{
"transform": "bucket[4]",
"source-id": 3,
"direction": "desc",
"null-order": "last"
}
]
}
],
```
**TODO items**
- Tests.
**Open items**
- Consider switching to a builder patter in `Catalog`.
- Whether to reserve id 0 for the unsorted order.
- Case sensitivity when binding `Term`s in `Builder`.
**Follow-up items**
- Associate data and delete files with sort order id.
- An API for updating the current sort order in a table.
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