Cheng Su created SPARK-34620:
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             Summary: Code-gen broadcast nested loop join (inner/cross)
                 Key: SPARK-34620
                 URL: https://issues.apache.org/jira/browse/SPARK-34620
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: Cheng Su


`BroadcastNestedLoopJoinExec` does not have code-gen, and we can potentially 
boost the CPU performance for this operator if we add code-gen for it. 
[https://databricks.com/blog/2017/02/16/processing-trillion-rows-per-second-single-machine-can-nested-loop-joins-fast.html]
 also showed the evidence in one fork.



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