wuchong commented on a change in pull request #17438:
URL: https://github.com/apache/flink/pull/17438#discussion_r725427333
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File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/catalog/AbstractCatalogTable.java
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@@ -37,18 +39,18 @@
// Properties of the table
private final Map<String, String> options;
// Comment of the table
- private final String comment;
+ @Nullable private final String comment;
public AbstractCatalogTable(
- TableSchema tableSchema, Map<String, String> options, String
comment) {
+ TableSchema tableSchema, Map<String, String> options, @Nullable
String comment) {
this(tableSchema, new ArrayList<>(), options, comment);
}
public AbstractCatalogTable(
TableSchema tableSchema,
List<String> partitionKeys,
Map<String, String> options,
- String comment) {
+ @Nullable String comment) {
Review comment:
According to the Javadoc of `getComment()`, it doesn't say the return
value can be null. There is no `@Nullable` annotation on the return type as
well. The default implementation of `CatalogTable#getComment` and
`CatalogView#getComment` (`DefaultCatalogTable`, `DefaultCatalogView`) returns
empty string instead of null.
Therefore, would be better to return `comment != null ? comment : ""` in
`AbstractCatalogTable#getComment` as well.
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