Method hash

core/src/main/java/com/alibaba/druid/sql/SQLUtils.java:1844–1867

(String sql, DbType dbType)

    }

    public static long hash(String sql, DbType dbType) {
        Lexer lexer = SQLParserUtils.createLexer(sql, dbType);

        StringBuilder buf = new StringBuilder(sql.length());

        for (; ; ) {
            lexer.nextToken();

            Token token = lexer.token();
            if (token == Token.EOF) {
                break;
            }

            if (token == Token.ERROR) {
                return Utils.fnv_64(sql);
            }

            if (buf.length() != 0) {
                // skip
            }
        }

        return buf.hashCode();
    }

    public static SQLExpr not(SQLExpr expr) {
        if (expr instanceof SQLBinaryOpExpr) {