presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitDoublePrecisionType
class AstBuilder:    @Override
    public Node visitDoublePrecisionType(SqlBaseParser.DoublePrecisionTypeContext context)
    {
        return new GenericDataType(
                getLocation(context),
                new Identifier(getLocation(context.DOUBLE()), context.DOUBLE().getText(), false),
                ImmutableList.of());
    }