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### What changes were proposed in this pull request? Use the new framework to resolve the DESCRIBE TABLE command. The v1 DESCRIBE TABLE command supports both table and view. Checked with Hive and Presto, they don't have DESCRIBE TABLE syntax but only DESCRIBE, which supports both table and view: 1. https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-DescribeTable/View/MaterializedView/Column 2. https://prestodb.io/docs/current/sql/describe.html We should make it clear that DESCRIBE support both table and view, by renaming the command to `DescribeRelation`. This PR also tunes the framework a little bit to support the case that a command accepts both table and view. ### Why are the changes needed? This is a part of effort to make the relation lookup behavior consistent: SPARK-29900. Note that I make a separate PR here instead of #26921, as I need to update the framework to support a new use case: accept both table and view. ### Does this PR introduce any user-facing change? no ### How was this patch tested? existing tests Closes #27187 from cloud-fan/describe. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: Xiao Li <gatorsmile@gmail.com> |
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