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### What changes were proposed in this pull request? Add ShowColumnsStatement and make SHOW COLUMNS go through the same catalog/table resolution framework of v2 commands. ### Why are the changes needed? It's important to make all the commands have the same table resolution behavior, to avoid confusing end-users. e.g. USE my_catalog DESC t // success and describe the table t from my_catalog SHOW COLUMNS FROM t // report table not found as there is no table t in the session catalog ### Does this PR introduce any user-facing change? yes. When running SHOW COLUMNS Spark fails the command if the current catalog is set to a v2 catalog, or the table name specified a v2 catalog. ### How was this patch tested? Unit tests. Closes #26182 from planga82/feature/SPARK-29523_SHOW_COLUMNS_datasourceV2. Authored-by: Unknown <soypab@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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