panbingkun commented on PR #47364:
URL: https://github.com/apache/spark/pull/47364#issuecomment-2268504350

   Hi, @mihailom-db, I have a few questions to ask:
   - Does the `CATALOG` here correspond to spark's `catalog`? (the default 
value should be `spark_catalog`, not `SYSTEM`) Meanwhile, does `SCHEMA` 
correspond to spark's `namespace(or schema)` (the default value should be 
`default`, not `BUILTIN `)?
   - If the dimension of our collation is in the `namespace` (or `schema`), 
should we implement `SHOW COLLATIONS ((FROM | IN) 
namespace=multipartIdentifier)? (LIKE? pattern)?;` instead of `SHOW COLLATIONS 
(LIKE? pattern)?;`?


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