[SPARK-47102] Add COLLATION_ENABLED config flag

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.0
• Component/s: SQL
• Labels: pull-request-available
• Epic Link: Collation support
• Assignee: Mihailo Milosevic
• Reporter: Mihailo Milosevic
• Created: 20/Feb/24 12:02
• Updated: 05/Mar/24 12:11
• Resolved: 05/Mar/24 12:11

Description

What changes were proposed in this pull request?
This PR adds COLLATION_ENABLED config to `SQLConf` and introduces new error class `COLLATION_SUPPORT_NOT_ENABLED` to appropriately report error on usage of feature under development. 

Why are the changes needed?
We want to make collations configurable on this flag. These changes disable usage of `collate` and `collation` functions, along with any `COLLATE` syntax when the flag is set to false. By default, the flag is set to false.

Issue Links

• links to: GitHub Pull Request #45218
• links to: GitHub Pull Request #45285