stevomitric opened a new pull request, #48546:
URL: https://github.com/apache/spark/pull/48546
### What changes were proposed in this pull request?
In this PR collations can now be identified by their fully qualified name,
as per the collation project plan. The `Collation` expression has been changed
to always return fully qualified name. Currently we only support predefined
collations.
### Why are the changes needed?
Make collation names behave as per the project spec.
### Does this PR introduce _any_ user-facing change?
Yes. Two user-facing changes are made:
1. Collation expression now returns fully qualified name:
```sql
select collation('a' collate utf8_lcase) -- returns
`SYSTEM.BUILTIN.UTF8_LCASE`
```
2. Collations can now be identified by their full qualified name:
```sql
select contains('a' collate system.builtin.utf8_lcase, 'A') -- returns true
```
### How was this patch tested?
New tests in this PR.
### Was this patch authored or co-authored using generative AI tooling?
No.
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