yuqi1129 edited a comment on pull request #1057:
URL: https://github.com/apache/calcite/pull/1057#issuecomment-660831795
@julianhyde
The cause of the problem is that, minus operator '-' is not right for type
BigDecimal when implementing unary minus function
For example
```
int a = 1;
int b = -a;
```
The above is Ok, however, problem exists in the code below
```
BigDecimal a = BigDecimal.valueOf("1");
BigDecimal b = -a; //wrong
BigDecimal c = a.nagate();//right
```
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