maropu commented on a change in pull request #31887:
URL: https://github.com/apache/spark/pull/31887#discussion_r607421098
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
##########
@@ -3799,23 +3801,26 @@ object functions {
ArrayExcept(col1.expr, col2.expr)
}
+ // counter to ensure lambda variable names are unique
+ private val lambdaVarNameCounter = new AtomicInteger(0)
Review comment:
How about defining a companion object for UnresolvedNamedLambdaVariable
like this?
```
object UnresolvedNamedLambdaVariable {
// counter to ensure lambda variable names are unique
private val lambdaVarNameCounter = new AtomicInteger(0)
def apply(args: Seq[String]): UnresolvedNamedLambdaVariable = {
// add a counter number in the suffix
}
}
```
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala
##########
@@ -2261,6 +2261,32 @@ class DataFrameFunctionsSuite extends QueryTest with
SharedSparkSession {
assert(ex3.getMessage.contains("cannot resolve 'a'"))
}
+ test("nested transform (DSL)") {
Review comment:
nit: `nested transform (DSL)` -> `SPARK-34794: nested transform`
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala
##########
@@ -2261,6 +2261,32 @@ class DataFrameFunctionsSuite extends QueryTest with
SharedSparkSession {
assert(ex3.getMessage.contains("cannot resolve 'a'"))
}
+ test("nested transform (DSL)") {
+ val df = Seq(
+ (Seq(1, 2, 3), Seq("a", "b", "c"))
+ ).toDF("numbers", "letters")
+
+ checkAnswer(
+ df.select(
+ flatten(
+ transform(
+ $"numbers",
+ (number: Column) => transform(
Review comment:
I think we need exhaustive tests for this issue, e.g., two/three
argument cases and their combination cases.
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