cloud-fan commented on a change in pull request #26173: [SPARK-29503][SQL] Copy
result row from RowWriter in GenerateUnsafeProjection when the expression is
lambdaFunction in MapObject
URL: https://github.com/apache/spark/pull/26173#discussion_r336848783
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateUnsafeProjection.scala
##########
@@ -310,8 +312,19 @@ object GenerateUnsafeProjection extends
CodeGenerator[Seq[Expression], UnsafePro
|$evalSubexpr
|$writeExpressions
""".stripMargin
+
+ val runInsideLoop = expressions.exists {
+ case _: LambdaVariable => true
+ case _ => false
+ }
+ val extractValueCode = if (runInsideLoop) {
+ s"$rowWriter.getRow().copy()"
+ } else {
+ s"$rowWriter.getRow()"
+ }
Review comment:
Agree that we should fix `CodegenContext.generateExpressionAndCopyIfUnsafe`.
To simplify codegen, maybe we can add `copyUnsafeData` to
`InternalRow`/`ArrayData`/`MapData`.
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