fallintoplace opened a new pull request, #1064:
URL: https://github.com/apache/arrow-go/pull/1064

   ## What changed
   
   Clear the validity bit using the null index relative to `startOffset` when 
exporting a dictionary suffix.
   
   ## Why
   
   `GetDictArrayData` builds a new dictionary whose bitmap starts at the 
requested offset, but it previously cleared the absolute memo-table index. For 
nonzero offsets this could mark the wrong dictionary entry valid while still 
reporting one null.
   
   The regression test exports a suffix containing a null and verifies that the 
corresponding relative entry is null.
   
   ## Testing
   
   - `go test ./arrow/array`


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