question: protected Function < Object [ ] , Object > createKeyGenerator ( Schema schema , TableId columnSetName , List < Column > columns ) { if ( schema != null ) { int [ ] recordIndexes = indexesForColumns ( columns ) ; Field [ ] fields = fieldsForColumns ( schema , columns ) ; int numFields = recordIndexes . length ; ValueConverter [ ] converters = convertersForColumns ( schema , columnSetName , columns , null , null ) ; return null ; } return null ; }
target:  Creates the function that produces a Kafka Connect key object for a row of data.