[GitHub] [spark] jzhuge opened a new pull request #24718: [SPARK-27322][SQL] DataSourceV2: Select from multiple catalogs

[GitBox <gi...@apache.org>]

jzhuge opened a new pull request #24718:  [SPARK-27322][SQL] DataSourceV2: Select from multiple catalogs
URL: https://github.com/apache/spark/pull/24718
 
 
   ## What changes were proposed in this pull request?
   
   Support multi-catalog in the following SELECT code paths:
   
   - SELECT * FROM catalog.db.tbl
   - TABLE catalog.db.tbl
   - JOIN or UNION tables from different catalogs
   - SparkSession.table("catalog.db.tbl")
   - CTE relation: WITH cte AS (SELECT * FROM catalog.db.tbl) SELECT * FROM cte
   - View text: CREATE VIEW view AS SELECT * FROM catalog.db.tbl; SELECT * FROM view
   
   ## How was this patch tested?
   
   New unit tests.
   Existing unit tests.
   

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