[SPARK-48574] Fix support for StructTypes with collations - ASF JIRA

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Details

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

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.