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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/05/28 23:23:00 UTC
[jira] [Commented] (SPARK-35560) Remove redundant subexpression
evaluation in nested subexpressions
[ https://issues.apache.org/jira/browse/SPARK-35560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17353633#comment-17353633 ]
Apache Spark commented on SPARK-35560:
--------------------------------------
User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/32699
> 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
> Priority: Major
>
> 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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