yuqi1129 opened a new pull request, #13349:
URL: https://github.com/apache/gravitino/pull/13349

   ### What changes were proposed in this pull request?
   
   Reject `VarChar(n)` for ClickHouse table creation and column addition with 
an error that names the supported alternatives. Update the type documentation 
and tests that previously relied on implicit conversion to `String`.
   
   ### Why are the changes needed?
   
   ClickHouse does not enforce a `varchar(n)` length limit. Gravitino currently 
reports success and echoes the requested type, but later loads the column as 
`string`.
   
   Fix: #13348
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes. Creating or adding a ClickHouse `varchar(n)` column now fails with 
guidance to use `string` or `fixedchar(n)`.
   
   ### How was this patch tested?
   
   - `:catalogs-contrib:catalog-jdbc-clickhouse:spotlessCheck`
   - `:catalogs-contrib:catalog-jdbc-clickhouse:test -PskipITs --tests 
org.apache.gravitino.catalog.clickhouse.converter.TestClickHouseTypeConverter 
--tests 
org.apache.gravitino.catalog.clickhouse.operations.TestClickHouseTableOperationsUnit`
 (37 tests passed)
   


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