Kimahriman commented on a change in pull request #32559:
URL: https://github.com/apache/spark/pull/32559#discussion_r633911273
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/SubexpressionEliminationSuite.scala
##########
@@ -309,6 +309,22 @@ class SubexpressionEliminationSuite extends SparkFunSuite
with ExpressionEvalHel
CodeGenerator.compile(code)
}
}
+
+ test("SPARK-35410: SubExpr elimination should not include redundant child
exprs " +
+ "for conditional expressions") {
Review comment:
Found a non-conditional example that still is an issue even with this
update (a bit contrived, but I'm sure there's a real use case)
```
val myUdf = udf(() => {
println("In UDF")
1
}).withName("myUdf")
spark.range(1).withColumn("a", myUdf()).select(($"a" + $"a") / ($"a" +
$"a")).show()
```
This generates subexpressions myUdf() and (myUdf() + myUdf()), even though
only the second one is used.
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