xuefuz 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_r284478411
##########
File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/catalog/GenericInMemoryCatalog.java
##########
@@ -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:
Nit: The comment doesn't seem explaining well why we want to put the check.
Instead of "thus ...", we can probably say ". However, to be consistent with
other catalogs, we check if...".
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