Feature: support for retrieving metadata from index file in C interface

[alexbarev]

Describe what you are looking for

Hey, I found an unobvious behaviour with the Go code related to the index pointer and configuration. Here's what's going on:

1. In the Load function only the index pointer is set up, but the configuration is left with incorrect dimensions.

   usearch/golang/lib.go

   Lines 341 to 356 in e686a3d

   	func (index *Index) Load(path string) error {
   	if index.opaque_handle == nil {
   	panic("Index is uninitialized")
   	}
   	c_path := C.CString(path)
   	defer C.free(unsafe.Pointer(c_path))
   	var errorMessage *C.char
   	C.usearch_load((C.usearch_index_t)(unsafe.Pointer(index.opaque_handle)), c_path, (*C.usearch_error_t)(&errorMessage))
   	if errorMessage != nil {
   	return errors.New(C.GoString(errorMessage))
   	}
   	return nil
   	}

2. In the Get function, a vector is created with a length based on dimensions from config.

   usearch/golang/lib.go

   Line 289 in e686a3d

   vector = make([]float32, index.config.Dimensions)

   
   Same in the Search function

   usearch/golang/lib.go

   Line 306 in e686a3d

   if len(query) != int(index.config.Dimensions) {

3. The dimensions come from the config struct, but it looks like it might not be set up properly. Since the Load function doesn't set the dimensions, and user can forget to do that explicitly.

One solution might be to set dimensions in Load function.

Or better to add support for metadata loading in C interface, as it is done for Python.

Can you contribute to the implementation?

• I can contribute

Is your feature request specific to a certain interface?

Other bindings

Contact Details

No response

Is there an existing issue for this?

• I have searched the existing issues

Code of Conduct

• I agree to follow this project's Code of Conduct

[ashvardanian]

Great catch! Should be an easy patch

[ashvardanian]

🎉 This issue has been resolved in version 2.8.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀