jingshanglu commented on issue #7998:
URL: https://github.com/apache/shardingsphere/issues/7998#issuecomment-724486937
@strongduanmu @tristaZero I think it's better to use a new subclass of
`ExpressionSegment` to describe functions.Becausel, functions not only exist in
projection. There are two ways to define a function expression. One is to see
the function function through the class name,like that:
```
class CharFunction implements ExpressionSegment {
List<ExpressionSegment> parameters;
}
```
and the other is to know the function function function through the
attribute in the class, like that:
```
class Function implements ExpressionSegment {
String/enum type/methodName;
List<ExpressionSegment> parameters;
```
According our sence, we choose one of them.
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