为什么自定义符号很多不支持 比如 ≠、≥、≤

[chengliangcode]

Caused by: com.alibaba.qlexpress4.exception.QLSyntaxException: [Error SYNTAX_ERROR: rule nextStatement failed predicate: {_input.LA(1) == Token.EOF || _input.LA(1) == QLexer.RBRACE}?]
[Near: 1 ≠ 2]
^
[Line: 1, Column: 2]
at com.alibaba.qlexpress4.exception.QLException.reportScannerErr(QLException.java:56)
at com.alibaba.qlexpress4.aparser.QLErrorListener.syntaxError(QLErrorListener.java:28)
at com.alibaba.qlexpress4.a4runtime.ProxyErrorListener.syntaxError(ProxyErrorListener.java:41)
at com.alibaba.qlexpress4.a4runtime.Parser.notifyErrorListeners(Parser.java:544)
at com.alibaba.qlexpress4.a4runtime.DefaultErrorStrategy.reportFailedPredicate(DefaultErrorStrategy.java:344)
at com.alibaba.qlexpress4.a4runtime.DefaultErrorStrategy.reportError(DefaultErrorStrategy.java:142)
at com.alibaba.qlexpress4.aparser.QLParser.nextStatement(QLParser.java:469)

[DQinYuan]

这些字符太偏门了。。。都不在词法里，什么场景会用到这些字符呢？