bkietz commented on PR #43715:
URL: https://github.com/apache/arrow/pull/43715#issuecomment-2364144951

   This failure is due to nanoarrow's reliance on [post-0.15 stream 
continuations](https://github.com/bkietz/arrow/blob/de12a7af86261f82d799c4a9aef840d41ec0886b/docs/source/format/Columnar.rst?plain=1#L1224-L1226)
   ```
   Validating that 
/home/dewey/gh/arrow/../arrow-testing/data/arrow-ipc-stream/integration/0.14.1/generated_map.arrow_file
 reads identical to /tmp/tmpej5fzvgi/0.14.1_map.gold.json
   Command VALIDATE failed (22=Invalid argument): Expected 0xFFFFFFFF at start 
of message but found 0x0000011C
   ```
   
   and this one is because [pre 1.0 unions had null 
bufffers](https://github.com/bkietz/arrow/blob/de12a7af86261f82d799c4a9aef840d41ec0886b/format/Schema.fbs#L47-L50),
 which adds one more buffer per union field than we expect
   ```
   Validating that 
/home/dewey/gh/arrow/../arrow-testing/data/arrow-ipc-stream/integration/0.17.1/generated_union.arrow_file
 reads identical to /tmp/tmpej5fzvgi/0.17.1_union.gold.json
   Command VALIDATE failed (22=Invalid argument): Expected 24 buffers in 
message but found 28
   ```


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