[SPARK-12113][SQL] Add some timing metrics for blocking pipelines

[maropu]

What changes were proposed in this pull request?

This is rework based on #10116

How was this patch tested?

Manually checked

[maropu]

This pr add a new metric as follows;

[SparkQA]

Test build #60708 has finished for PR 13736 at commit 9d2d40d.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class SQLDiffMetric(metricType: String, startTime: Long = 0L, initValue: Long = 0L)

[maropu]

I'm looking into this to fix bugs...

[maropu]

Jenkins, retest this please.

[SparkQA]

Test build #60796 has finished for PR 13736 at commit 505c05b.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #60801 has finished for PR 13736 at commit 505c05b.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #60798 has finished for PR 13736 at commit 0c99ccf.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[maropu]

@rxin okay, ready to review. After the v2.0 release, plz check this.

[SparkQA]

Test build #64051 has finished for PR 13736 at commit 7ccd981.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #68862 has finished for PR 13736 at commit 10dca0e.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[maropu]

I think this pr got stale, so I'll close this, thanks.