HappenLee commented on code in PR #30392:
URL: https://github.com/apache/doris/pull/30392#discussion_r1470762414
##########
be/src/vec/functions/function_string.h:
##########
@@ -1866,6 +1866,159 @@ class FunctionSubstringIndex : public IFunction {
String get_name() const override { return name; }
size_t get_number_of_arguments() const override { return 3; }
+ DataTypePtr get_return_type_impl(const DataTypes& arguments) const
override {
+ return std::make_shared<DataTypeString>();
+ }
+
+ bool use_default_implementation_for_nulls() const override { return true; }
Review Comment:
no need overrite the fun，the default is `true`
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