tomtongue opened a new pull request, #38268:
URL: https://github.com/apache/spark/pull/38268
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### What changes were proposed in this pull request?
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Currently `RenameTableExec` only handles an empty namespace for destination
tables as the following current spec:
(3.3.0 is picked up)
https://github.com/apache/spark/blob/v3.3.0/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/RenameTableExec.scala#L48
```
# L48
val qualifiedNewIdent = if (newIdent.namespace.isEmpty) {
Identifier.of(oldIdent.namespace, newIdent.name)
} else newIdent
```
This part doesn't handle the case where a destination table is specified
catalog.db.table. If catalog.db.table is passed to `ALTER TABLE <src> RENAME TO
<dst>` query, there's a difference of handling namespaces between source and
destination tables. Specifically, source tables can be correctly handled as
`[db]` for its namespace, but destination tables is handled as `[catalog, db]`
for its namespace.
### Why are the changes needed?
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This change provide handling destination names that include catalog name as
`catalog.db.table`.
For example, Apache Iceberg is expected to handle the destination table as
catalog.db.table in the document;
[https://iceberg.apache.org/docs/latest/spark-ddl/#alter-table--rename-to](https://iceberg.apache.org/docs/latest/spark-ddl/#alter-table--rename-to.)
### Does this PR introduce _any_ user-facing change?
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No. Keep the compatibility with the current spec.
### How was this patch tested?
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An unit test is added. The test checks whether renaminga table name is
successful or not if dst for ALTER TABLE RENAME TO has catalog name as `ALTER
TABLE src RENAME TO catalog.db.table`.
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