[
https://issues.apache.org/jira/browse/SPARK-35560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Apache Spark reassigned SPARK-35560:
------------------------------------
Assignee: L. C. Hsieh (was: Apache Spark)
> 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);
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
