cloud-fan commented on code in PR #39949:
URL: https://github.com/apache/spark/pull/39949#discussion_r1129375326
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sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUDFs.scala:
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@@ -194,47 +183,52 @@ private[hive] case class HiveGenericUDF(
override protected def withNewChildrenInternal(newChildren:
IndexedSeq[Expression]): Expression =
copy(children = newChildren)
- override protected def doGenCode(ctx: CodegenContext, ev: ExprCode):
ExprCode = {
- val refTerm = ctx.addReferenceObj("this", this)
- val childrenEvals = children.map(_.genCode(ctx))
-
- val setDeferredObjects = childrenEvals.zipWithIndex.map {
Review Comment:
codegen is performance critical. Previously, we generate code to directly
set values for `deferredObjects`, but in this PR we always create a `Object[]`
to wrap the arguments, which can be bad for performance.
This is a signal that `Invoke` doesn't work very well for Hive UDF. It's
still valuable to have something like `HiveGenericUDFInvokeAdapter` to share
code between interpreted code path and codegen code path.
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