[SPARK-48574] Fix support for StructTypes with collations

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.0
• Component/s: SQL
• Labels: pull-request-available
• Epic Link: Collation support
• Assignee: Mihailo Milosevic
• Reporter: Mihailo Milosevic
• Created: 08/Jun/24 15:04
• Updated: 19/Jun/24 08:08
• Resolved: 19/Jun/24 08:08

Description

While adding expression walker it was noticed that StructType support is broken. One problem is that `CollationsTypeCasts` is doing a cast in all BinaryExpressions which includes ExtractValue. Consequently, we are unable to extract value if we do a cast there, as ExtractValue only supports nonNullLiterals as extracting keys.

Issue Links

• links to: GitHub Pull Request #46997