[SPARK-33007] Optimize to_json + named_struct + from_json expression chain

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.1.0
• Component/s: SQL
• Assignee: L. C. Hsieh
• Reporter: L. C. Hsieh
• Created: 26/Sep/20 23:53
• Updated: 07/Oct/20 00:04
• Resolved: 07/Oct/20 00:04

Description

Due to query optimization, it is possibly to generate inefficient json expression chain like to_json(named_struct(col1, from_json(json).col1, col2, from_json(json).col2), ....). We could optimize it.

Issue Links

• links to: [Github] Pull Request #29942 (viirya)