question: public Builder map ( String fullyQualifiedColumnNames , ColumnMapper mapper ) { Predicate < ColumnId > columnMatcher = Predicates . includes ( fullyQualifiedColumnNames , null ) ; rules . add ( new MapperRule ( columnMatcher , mapper ) ) ; return this ; }
target:  Set a mapping function for the columns with fully-qualified names that match the given comma-separated list of regular expression patterns.