Revert [SPARK-19355][SPARK-25352]

[viirya]

What changes were proposed in this pull request?

This goes to revert sequential PRs based on some discussion and comments at #16677 (comment).

#22344
#22330
#22239
#16677

How was this patch tested?

Existing tests.

[viirya]

cc @cloud-fan

[cloud-fan]

LGTM, thanks!

[SparkQA]

Test build #96320 has finished for PR 22481 at commit 4532aaa.

• This patch fails due to an unknown error code, -9.
• 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

[dilipbiswal]

retest this please

[SparkQA]

Test build #96332 has finished for PR 22481 at commit 4532aaa.

• 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]

thanks, merging to master/2.4!