roryqi opened a new issue, #12127:
URL: https://github.com/apache/gravitino/issues/12127
### Describe the feature
Implement assignment-level values for tags so one metadata object can assign
multiple values to the same tag.
### Motivation
Current tag assignment is boolean. Users need searchable tag values such as
`data_domain=finance` without creating one tag per value.
### Describe the solution
- Add `allowedValues` to tag creation and tag DTOs.
- Change `tagsToAdd` and `tagsToRemove` to tag-value pair arrays.
- Store one value per `tag_relation_meta` row with `tag_value` and
`value_order`.
- Make repeated assignment idempotent and use exact value lookup through
`GET /tags/{tag}/objects?value=...`.
### Additional context
Initial implementation does not support modifying `allowedValues` after tag
creation.
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