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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/06/06 12:41:42 UTC

[GitHub] [arrow-datafusion] alamb commented on issue #2122: JIT-Compile DataFusion Expressions to create `RecordBatches`

alamb commented on issue #2122:
URL: https://github.com/apache/arrow-datafusion/issues/2122#issuecomment-1147404652

    datafusion `PhysicalExpr` and `arrow-rs` library currently evaluate expressions by "materializing intermediate results" -- for example `(a + b) + c` results in first evaluating `(a+b)` to a temporary location and then adding `c` to form the final result. 
   
   Note however, there is a tradeoff here between the speed gained using the LLVM optimized vectorized kernels in `arrow-rs` and cranelift generated JIT expressions where JIT may not actually be faster. I think this is what @Dandandan  is referring to when he says "allow for possible use of SIMD instructions, either explicitly by instrumenting cranelift enough or through auto-vectorization."
   
   
   


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