imback82 opened a new pull request #25601: [SPARK-28856][SQL] Implement SHOW DATABASES for Data Source V2 Tables URL: https://github.com/apache/spark/pull/25601 ### What changes were proposed in this pull request? Implement the SHOW DATABASES logical and physical plans for data source v2 tables. ### Why are the changes needed? To support `SHOW DATABASES` SQL commands for v2 tables. ### Does this PR introduce any user-facing change? `spark.sql("SHOW DATABASES")` will return namespaces if the default catalog is set: ``` +---------------+ | namespace| +---------------+ | ns1| | ns1.ns1_1| |ns1.ns1_1.ns1_2| +---------------+ ``` ### How was this patch tested? Added unit tests to `DataSourceV2SQLSuite`.
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