[SPARK-27580][SQL] Implement doCanonicalize in BatchScanExec for comparing query plan results

[gengliangwang]

What changes were proposed in this pull request?

The method QueryPlan.sameResult is used for comparing logical plans in order to:

1. cache data in CacheManager
2. uncache data in CacheManager
3. Reuse subqueries
4. etc...

Currently the method sameReuslt always return false for BatchScanExec. We should fix it by implementing doCanonicalize for the node.

How was this patch tested?

Unit test

[gengliangwang]

@cloud-fan

[SparkQA]

Test build #104950 has finished for PR 24475 at commit 8a7cc19.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #104945 has finished for PR 24475 at commit 0130f07.

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

[cloud-fan]

thanks, merging to master!