bowenli86 commented on a change in pull request #8212: [FLINK-11519][table] Add 
function related catalog APIs
URL: https://github.com/apache/flink/pull/8212#discussion_r277950075
 
 

 ##########
 File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/catalog/ReadableCatalog.java
 ##########
 @@ -132,4 +133,36 @@
         */
        boolean tableExists(ObjectPath objectPath) throws CatalogException;
 
+       // ------ functions ------
+
+       /**
+        * List the names of all functions in the given database. An empty list 
is returned if none is registered.
+        *
+        * @param dbName        Name of the database.
 
 Review comment:
   replace tab with space, also should use lower case for starting character, 
like "name of the database"
   
   all javadoc in this file needs some reformatting

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