Yicong-Huang opened a new pull request, #967:
URL: https://github.com/apache/arrow-java/pull/967

   ## What's Changed
   
   Fix offset buffer not allocated for nested empty 
`ListVector`/`LargeListVector` during IPC serialization.
   
   When outer array is empty, nested writers are never invoked, so child list's 
offset buffer remains unallocated (`capacity = 0`). This violates Arrow spec 
which requires `offset[0] = 0`.
   
   ### Fix
   
   Apply the same fix to `getFieldBuffers()` as in `exportCDataBuffers()`: 
allocate offset buffer if `capacity == 0`.
   
   ### Testing
   
   Added tests for nested empty lists verifying offset buffer allocation and 
`offset[0] = 0`.
   
   Closes #343.
   


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