Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/14476#discussion_r73458295
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
---
@@ -82,7 +82,7 @@ abstract class ExternalCatalog {
* Note: If the underlying implementation does not support altering a
certain field,
* this becomes a no-op.
*/
- def alterTable(db: String, tableDefinition: CatalogTable): Unit
+ def alterTable(tableDefinition: CatalogTable): Unit
--- End diff --
Let's add doc to explain that it does not support moving a table to another
db since a developer want to use it in this way by just looking at this API
(tableDefinition has a db field).
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