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Expression, RecordBatch -> ColumnarArray
Compile SQL-like expressions or projection/filter logic into LLVM IR to execute directly over contiguous columnar memory arrays.
Problem it solves
Evaluating expressions row-by-row using interpreters introduces virtual function call overhead and misses vectorization opportunities.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.