presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitBasicStringLiteral
class AstBuilder:    @Override
    public Node visitBasicStringLiteral(SqlBaseParser.BasicStringLiteralContext context)
    {
        return new StringLiteral(getLocation(context), unquote(context.STRING().getText()));
    }