pvary commented on code in PR #17874:
URL: https://github.com/apache/iceberg/pull/17874#discussion_r4069161869
##########
flink/v2.3/flink/src/main/java/org/apache/iceberg/flink/FlinkCatalog.java:
##########
@@ -641,6 +662,56 @@ private void createIcebergView(
}
}
+ private void alterIcebergView(
+ ObjectPath tablePath, ResolvedCatalogView newView, boolean
ignoreIfNotExists)
+ throws TableNotExistException, CatalogException {
+ View view;
+ try {
+ view = asViewCatalog.loadView(toIdentifier(tablePath));
+ } catch (NoSuchViewException e) {
+ if (!ignoreIfNotExists) {
+ throw new TableNotExistException(getName(), tablePath, e);
+ }
+
+ return;
+ }
+
+ SQLViewRepresentation currentRepresentation = view.sqlFor(FLINK_DIALECT);
+ if (currentRepresentation == null
+ || !newView.getExpandedQuery().equals(currentRepresentation.sql())) {
+ // a new query becomes a new view version, stored the same way
createIcebergView stores
+ // one: the expanded query, with the defaults recording the resolution
context
+ view.replaceVersion()
+ .withQuery(FLINK_DIALECT, newView.getExpandedQuery())
+ .withSchema(FlinkSchemaUtil.convert(newView.getResolvedSchema()))
+ .withDefaultCatalog(getName())
+ .withDefaultNamespace(appendLevel(baseNamespace,
tablePath.getDatabaseName()))
+ .commit();
+ }
+
+ // only set changed or added properties: Flink SQL cannot express a
property removal
+ // (ALTER VIEW SET merges), and removing keys absent from the incoming
options could
+ // strip properties that Flink did not carry over
+ Map<String, String> newProperties = Maps.newHashMap(newView.getOptions());
+ if (!StringUtils.isNullOrWhitespaceOnly(newView.getComment())) {
+ newProperties.put(ViewProperties.COMMENT, newView.getComment());
+ }
+
+ Map<String, String> currentProperties = view.properties();
+ UpdateViewProperties update = view.updateProperties();
+ boolean changed = false;
+ for (Map.Entry<String, String> entry : newProperties.entrySet()) {
Review Comment:
Shall we remove absent keys?
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