[GitHub] [arrow] HaoChen-ch commented on issue #12942: [c++][substrait]Couldn't find a file named expression.pb

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HaoChen-ch commented on issue #12942:
URL: https://github.com/apache/arrow/issues/12942#issuecomment-1105197244

   Thanks very much for the reply.
   
   > It should be downloaded automatically as part of the build: https://github.com/apache/arrow/blob/master/cpp/cmake_modules/ThirdpartyToolchain.cmake#L1635-L1706
   > 
   > It's generated code from a .proto file which comes from the Substrait repository (an old version at the moment): https://github.com/substrait-io/substrait/blob/1210195692df721e05a9e9bd34fd7b9ae83dd35c/proto/substrait/expression.proto
   > 
   > The file in Substrait has since moved into algebra.proto
   
   @westonpace  Thanks very much for the reply. I ran the arrow engine successfully with your help.And I plan to do some work with arrow,First I need to choose a IR to describe computation on Arrow data,I have read the email https://www.mail-archive.com/dev@arrow.apache.org/msg24388.html .And I am confused about which one to choose , substrait or Arrow Compute IR.Could you give me some advice? 


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