VaibhaveS opened a new pull request, #24200:
URL: https://github.com/apache/datafusion/pull/24200

   ## Which issue does this PR close?
   
   - Closes #15960.
   
   ## Rationale for this change
   
   Catalog-qualified information schema queries currently return metadata from 
every registered catalog.
   
   For example, `my_catalog.information_schema.tables` should describe only 
`my_catalog`, consistent with PostgreSQL's information schema representing the 
current database.
   
   ## What changes are included in this PR?
   
   `InformationSchemaProvider` now receives one resolved catalog directly. 
Tables, columns, views, and schemas are enumerated only from that catalog.
   
   Unqualified `information_schema` queries now use the configured default 
catalog instead of returning metadata from all catalogs.
   
   ## Are these changes tested?
   
   Yes. Added multi-catalog SQL logic coverage for qualified and unqualified 
information schema queries.
   
   ## Are there any user-facing changes?
   
   Yes. Information schema results are now scoped to the resolved catalog.
   
   The `InformationSchemaProvider::new` signature now accepts a catalog name 
and `CatalogProvider`.


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