[SPARK-27701] Extend NestedColumnAliasing to more nested field cases

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: L. C. Hsieh
• Reporter: L. C. Hsieh
• Created: 14/May/19 10:08
• Updated: 12/Jun/19 04:07
• Resolved: 12/Jun/19 03:13

Description

NestedColumnAliasing rule covers GetStructField only, currently. It means that some nested field extraction expressions aren't pruned. For example, if only accessing a nested field in an array of struct, this column isn't pruned. This patch extends the rule to cover such cases.

Issue Links

• links to: GitHub Pull Request #24599