presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitUnicodeStringLiteral
class AstBuilder:    @Override
    public Node visitUnicodeStringLiteral(SqlBaseParser.UnicodeStringLiteralContext context)
    {
        return new StringLiteral(getLocation(context), decodeUnicodeLiteral(context));
    }