[jira] [Created] (SPARK-35560) Remove redundant subexpression evaluation in nested subexpressions

["L. C. Hsieh (Jira)" <ji...@apache.org>]

L. C. Hsieh created SPARK-35560:
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             Summary: Remove redundant subexpression evaluation in nested subexpressions
                 Key: SPARK-35560
                 URL: https://issues.apache.org/jira/browse/SPARK-35560
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: L. C. Hsieh
            Assignee: L. C. Hsieh


In some cases, whole-stage codegen's subexpression elimination will do redundant subexpression evaluation. We should reduce it. For example, if we have two sub-exprs:

1. simpleUDF($"id")
2. functions.length(simpleUDF($"id"))


We should only evaluate `simpleUDF($"id")` once, i.e.

subExpr1 = simpleUDF($"id");
subExpr2 = functions.length(subExpr1);



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