pvary commented on code in PR #17874:
URL: https://github.com/apache/iceberg/pull/17874#discussion_r4092623046
##########
flink/v2.3/flink/src/main/java/org/apache/iceberg/flink/FlinkCatalog.java:
##########
@@ -641,6 +642,101 @@ private void createIcebergView(
}
}
+ private void alterCatalogView(
+ ObjectPath tablePath, CatalogBaseTable newTable, boolean
ignoreIfNotExists)
+ throws TableNotExistException, CatalogException {
+ if (asViewCatalog == null) {
+ throw new UnsupportedOperationException(
+ "Altering a view is not supported by catalog: " + getName());
+ }
+
+ Preconditions.checkArgument(
+ newTable instanceof ResolvedCatalogView,
+ "Expected a ResolvedCatalogView but got: %s",
+ newTable.getClass().getName());
+ alterIcebergView(tablePath, (ResolvedCatalogView) newTable,
ignoreIfNotExists);
+ }
+
+ private void alterIcebergView(
+ ObjectPath tablePath, ResolvedCatalogView newView, boolean
ignoreIfNotExists)
+ throws TableNotExistException, CatalogException {
+ TableIdentifier identifier = toIdentifier(tablePath);
+ View view;
+ try {
+ view = asViewCatalog.loadView(identifier);
+ } catch (NoSuchViewException e) {
+ if (!ignoreIfNotExists) {
+ throw new TableNotExistException(getName(), tablePath, e);
+ }
+
+ return;
+ }
+
+ Map<String, String> newProperties = Maps.newHashMap(newView.getOptions());
+ if (!StringUtils.isNullOrWhitespaceOnly(newView.getComment())) {
+ newProperties.put(ViewProperties.COMMENT, newView.getComment());
+ }
+
+ SQLViewRepresentation currentRepresentation = view.sqlFor(FLINK_DIALECT);
+ // only an unchanged flink representation counts as the same query: sqlFor
may fall back to
+ // another engine's dialect, and matching against that must not skip
storing a flink one
+ boolean queryUnchanged =
+ currentRepresentation != null
+ && FLINK_DIALECT.equalsIgnoreCase(currentRepresentation.dialect())
+ && newView.getExpandedQuery().equals(currentRepresentation.sql());
Review Comment:
Check for the table schema changes too.
```
Schema newSchema = FlinkSchemaUtil.convert(newView.getResolvedSchema());
boolean definitionUnchanged =
queryUnchanged && view.schema().sameSchema(newSchema);
```
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