MaxGekk commented on a change in pull request #31524:
URL: https://github.com/apache/spark/pull/31524#discussion_r572041366
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File path: docs/sql-ref-syntax-ddl-alter-table.md
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@@ -27,6 +27,9 @@ license: |
`ALTER TABLE RENAME TO` statement changes the table name of an existing table
in the database.
+If the table is cached, the commands clear cached data of the table and all
its dependents that refer to it. The cache will be lazily filled when the next
time the table or the dependents are accessed.
+The partition rename command keeps table dependents as cached but the table
rename does not. In this way dependents should be re-cached explicitly after
table renaming.
Review comment:
Look at the implementation
https://github.com/apache/spark/blob/2c243c93d9b107ed19fa21002d54deccd17ce50a/sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala#L201-L210
It uncaches tables (and its dependents), and caches ONLY the table back.
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