private static String processSpecialOperator(final String operator) {
        return "=".equals(operator) ? "equals" : operator;
    }
process special operator, like = need to change to equals.

@param operator {@linkplain OperatorEnum} alias
@return alias
shenyu-plugin/shenyu-plugin-base/src/main/java/org/apache/shenyu/plugin/base/condition/judge/PredicateJudgeFactory.java