[SPARK-20302] Short circuit cast when from and to types are structurally the same

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.2.0
• Component/s: SQL
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 12/Apr/17 04:27
• Updated: 12/Apr/17 08:30
• Resolved: 12/Apr/17 08:30

Description

When we perform a cast expression and the from and to types are structurally the same (having the same structure but different field names), we should be able to skip the actual cast.

Issue Links

• links to: [Github] Pull Request #17614 (rxin)