plusplusjiajia opened a new pull request, #8564:
URL: https://github.com/apache/paimon/pull/8564
### Purpose
`type` was missing from `IMMUTABLE_OPTIONS`, so `ALTER TABLE SET
('type'='format-table')` on a table with data succeeded. The next load then
builds a different table kind over the existing FileStore layout:
data files become unreadable, snapshot history is orphaned, and query auth
(row filters / column masks) is silently bypassed since only FileStore tables
wire it up.
In-place type change has no supported semantics (no tests/docs;
`replaceTable()` already does cross-type via drop-and-create), so mark `TYPE`
`@Immutable` like the other structural options.
### Tests
`SchemaManagerTest#testAlterImmutableOptionsOnEmptyTable`: `SET 'type'` on
a table with snapshots now throws `Change 'type' is not supported yet.`
### API and Format
No format change. `ALTER SET/RESET 'type'` on a table with snapshots
(previously undefined behavior) is now rejected.
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