[SPARK-17899][SQL][DO-NOT-MERGE] Check the Impact When Turning On spark.sql.debug

[gatorsmile]

What changes were proposed in this pull request?

DO NOT MERGE

This PR is just to do a quick check and see the impact of spark.sql.debug. Expect no actual failure should be seen.

How was this patch tested?

N/A

[SparkQA]

Test build #66940 has finished for PR 15478 at commit 26df77a.

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

[gatorsmile]

ALTER TABLE, ANALYZE TABLE and CREATE TABLE LIKE do not work well when spark.sql.debug is set to true.

[cloud-fan]

I don't think it's a problem, we will only set this flag when debugging.

[gatorsmile]

Yeah, I see. This is just for showing the impact. Thanks!