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Revision 9cf9304e171aa03166957d2fc5dd3d2f14c94f9e authored by Pablo Langa on 11 December 2019, 22:02:58 UTC, committed by Dongjoon Hyun on 11 December 2019, 22:02:58 UTC 
[SPARK-30038][SQL] DESCRIBE FUNCTION should do multi-catalog resolution
 
### What changes were proposed in this pull request?

Add DescribeFunctionsStatement and make DESCRIBE FUNCTIONS 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
DESCRIBE FUNCTIONS namespace.function

### Does this PR introduce any user-facing change?

Yes. When running DESCRIBE FUNCTIONS namespace.function Spark fails the command if the current catalog is set to a v2 catalog.

### How was this patch tested?

Unit tests.

Closes #26840 from planga82/feature/SPARK-30038_DescribeFunction_V2Catalog.

Authored-by: Pablo Langa <soypab@gmail.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
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