lxy-9602 commented on code in PR #391:
URL: https://github.com/apache/paimon-cpp/pull/391#discussion_r4113898116


##########
src/paimon/common/predicate/like.h:
##########
@@ -45,4 +46,6 @@ class Like : public StringLeafBinaryFunction {
  private:
     Like() = default;
 };
+
+PAIMON_EXPORT Result<bool> TestLikeString(const std::string& field, const 
std::string& pattern);

Review Comment:
   Thanks for fixing this issue!
   
   Would it be possible to avoid introducing the namespace-level 
`TestLikeString` function? We could export only a static member of `Like` 
instead:
   
   ```cpp
   class Like : public StringLeafBinaryFunction {
     public:
        PAIMON_EXPORT static Result<bool> MatchString(
            const std::string& field,
            const std::string& pattern);
   
        Result<bool> TestString(
            const std::string& field,
            const std::string& pattern) const override;
    };
    ```
   
    Then the bitmap reader could call:
   
    ```cpp
    return paimon::Like::MatchString(
        key.GetValue<std::string>(), pattern);
    ```
   
    `MatchString` could contain the existing matching implementation, while the 
virtual `TestString` delegates to it. This would keep the functionality scoped 
to `Like` while exporting only one static member symbol, without exposing the 
class hierarchy, vtable, or RTTI across shared-library boundaries.
   
   What do you think?



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