924060929 commented on code in PR #12416:
URL: https://github.com/apache/doris/pull/12416#discussion_r964629636
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/Substring.java:
##########
@@ -54,7 +54,7 @@ public Substring(Expression str, Expression pos) {
@Override
public DataType getDataType() {
- return StringType.INSTANCE;
+ return VarcharType.SYSTEM_DEFAULT;
Review Comment:
so you mean this?
```java
@Override
public DataType getDataType() {
if (getLength() instanceof IntegerLiteral) {
return VarcharType.createVarcharType(((IntegerLiteral)
getLength()).getValue());
}
return VarcharType.SYSTEM_DEFAULT;
}
```
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