kosak commented on PR #13775:
URL: https://github.com/apache/arrow/pull/13775#issuecomment-1206157229

   @pitrou I'm not sure *exactly* what you're asking me but I can say that I 
built arrow like this (before and after the change)
   
   ```
   cmake -DARROW_BUILD_STATIC=ON -DARROW_FLIGHT=ON -DARROW_CSV=ON 
-DARROW_FILESYSTEM=ON -DARROW_DATASET=ON -DARROW_PARQUET=ON         
-DARROW_WITH_BZ2=ON -DARROW_WITH_ZLIB=ON -DARROW_WITH_LZ4=ON 
-DARROW_WITH_SNAPPY=ON -DARROW_WITH_ZSTD=ON -DARROW_WITH_BROTLI=ON 
-DARROW_SIMD_LEVEL=NONE  ..
   make -j8
   ```
   
   and then I looked at the symbols from libarrow.so like this
   
   ```
   nm libarrow.so | grep flatbuffers | c++filt > ~/before_ns_switch.txt
   ```
   
   And I got the 84 symbols shown here:
   https://gist.github.com/kosak/f97a0a04f96a2c02957b33e4d110ad72
   
   The nice thing is that if you diff the two files (before_ns_switch.txt vs 
after_ns_switch.txt) with a graphical diff tool like kompare, they line up 
perfectly and you can see the namespace getting replaced in the right place for 
every line. Not sure how surprising that is, but I was glad to see it visually.
   


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