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

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: Gengliang Wang
• Reporter: Gengliang Wang
• Created: 26/Apr/19 20:38
• Updated: 29/Apr/19 17:26
• Resolved: 29/Apr/19 09:55

Description

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.

Issue Links

• links to: GitHub Pull Request #24475
• links to: GitHub Pull Request #24487
• links to: GitHub Pull Request #24488