yaooqinn opened a new pull request #27006: [SPARK-30352][SQL] DataSourceV2: Add CURRENT_CATALOG function URL: https://github.com/apache/spark/pull/27006 ### What changes were proposed in this pull request? As we support multiple catalogs with DataSourceV2, we may need the `CURRENT_CATALOG` value expression from the SQL standard. `CURRENT_CATALOG` is a general value specification in the SQL Standard, described as: > The value specified by CURRENT_CATALOG is the character string that represents the current default catalog name. ### Why are the changes needed? improve catalog v2 with ANSI SQL standard. ### Does this PR introduce any user-facing change? yes, add a new function `current_catalog()` to point the current active catalog ### How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible. If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future. If tests were not added, please describe why they were not added and/or why it was difficult to add. --> add ut
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