Revert [SPARK-19355][SPARK-25352]

[viirya]

What changes were proposed in this pull request?

This goes to revert SPARK-19355 and SPARK-25352, based on some discussion and comments at #16677 (comment).

How was this patch tested?

Existing tests.

[viirya]

cc @cloud-fan @rxin @hvanhovell

[HyukjinKwon]

@viirya, not a big deal but mind leaving few explicit discussion links (in the PRs you pointed out) to the current PR description?

[maropu]

I just put the link here: #16677 (comment)

[viirya]

Thanks @HyukjinKwon @maropu. I've put it in the PR description.

[SparkQA]

Test build #96240 has finished for PR 22464 at commit 8ee721c.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
• trait BaseLimitExec extends UnaryExecNode with CodegenSupport
• case class LocalLimitExec(limit: Int, child: SparkPlan) extends BaseLimitExec
• case class GlobalLimitExec(limit: Int, child: SparkPlan) extends BaseLimitExec

[cloud-fan]

@viirya Thanks for doing it! To ease the review, can you revert these 4 commits sequentially with git revert commit-hash? Thanks!
#22344
#22330
#22239
#16677

[viirya]

@cloud-fan Ok. Let me try it.

[viirya]

@cloud-fan Shall we have 4 PRs to revert these PRs individually? Or just one PR to includes 4 revert commits?

[cloud-fan]

just one PR including 4 commits