kou commented on PR #48491:
URL: https://github.com/apache/arrow/pull/48491#issuecomment-3678528297

   Thanks. I understand this situation and I also consider API.
   
   How about the following API?
   
   ```h
   GArrowMakeStructOptions *
   garrow_make_struct_options_new(void);
   void
   garrow_make_struct_options_add_field(GArrowMakeStructOptions *options, const 
char *name, gboolean nullability, GHashTable *metadata);
   
   // no getter or
   const char *
   garrow_make_struct_options_get_field_name(GArrowMakeStructOptions *options, 
gsize i);
   gboolean
   garrow_make_struct_options_get_field_nullability(GArrowMakeStructOptions 
*options, gsize i);
   GHashTable *
   garrow_make_struct_options_get_field_metadta(GArrowMakeStructOptions 
*options, gsize i);
   ```
   
   ```c
   GArrowMakeStructOptions *options = garrow_make_struct_options_new();
   garrow_make_struct_options_add_field(options, name1, nullability1, 
metadata1);
   garrow_make_struct_options_add_field(options, name2, nullability2, 
metadata2);
   ...
   ```


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