924060929 commented on code in PR #12416:
URL: https://github.com/apache/doris/pull/12416#discussion_r964580027
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/Substring.java:
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@@ -54,7 +54,7 @@ public Substring(Expression str, Expression pos) {
@Override
public DataType getDataType() {
- return StringType.INSTANCE;
+ return VarcharType.SYSTEM_DEFAULT;
Review Comment:
Keep the same type as OriginPlanner, BE can not found the function if return
StringType.
But I didn't try `new VarcharType(len)`, why we need a length here?
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