bowenli86 commented on a change in pull request #8458:
[FLINK-12452][table][hive] alterTable() should ensure existing base table and
the new one are of the same type
URL: https://github.com/apache/flink/pull/8458#discussion_r284488368
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File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/catalog/GenericInMemoryCatalog.java
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@@ -209,11 +209,17 @@ public void alterTable(ObjectPath tablePath,
CatalogBaseTable newTable, boolean
checkNotNull(tablePath);
checkNotNull(newTable);
- // TODO: validate the new and old CatalogBaseTable must be of
the same type. For example, this doesn't
- // allow alter a regular table to partitioned
table, or alter a view to a table, and vice versa.
- // And also add unit tests.
-
if (tableExists(tablePath)) {
+ CatalogBaseTable oldTable = tables.get(tablePath);
+
+ // Theoretically, in-memory catalog can store any
tables and views implementations
+ // thus, we need to check they are of the same class
Review comment:
there's a subtle difference between checks in in-memory catalog and
HiveCatalogBase.
HiveCatalogBase can only handle HiveCatalogTable/View (HiveCatalog) or
GenericCatalogTable/View (GenericHiveMetastoreCatalog), and user input is
already validated in validateCatalogBaseTable(). Thus, we only need to check if
the input is CatalogTable or CatalogView.
However, in-memory catalog can host any implementations of table and view,
thus we need to check here that they are of the same impl class, not just
whether it's a table or view.
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