pan3793 commented on PR #7419:
URL: https://github.com/apache/kyuubi/pull/7419#issuecomment-4342542070

   the JDBC API Javadocs say
   
   > "" retrieves those without a schema; `null` means that the schema name 
should not be used to narrow the search
   
   I interrupt it to
   
   - `""`: filter with `TABLE_SCHEM = <current schema>`
   - `null`: retrieve all schemas
   - `"%"`: filter with `TABLE_SCHEM LIKE '%'`, same as `null`
   
   I don't understand why `effectiveDatabase` substitution is required here?


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