presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/ColumnMapping.java/ColumnMapping/booleanMapping
class ColumnMapping:    public static ColumnMapping booleanMapping(Type prestoType, BooleanReadFunction readFunction, BooleanWriteFunction writeFunction)
    {
        return booleanMapping(prestoType, readFunction, writeFunction, UnaryOperator.identity());
    }