rdblue commented on issue #26929: [SPARK-30289][SQL] DSv2's partitioning should not accept nested columns URL: https://github.com/apache/spark/pull/26929#issuecomment-574783581 @dbtsai, Iceberg supports partitioning by fields in structs. We think of structs as a logical grouping of columns because values are still 1-to-1 with the row. Hive tables don't support partitioning by nested fields, which is why Hive tables should reject partition expressions that use nested fields. It's up to the catalog and table implementation to determine what is supported. The parser will recognize any multi-part identifier as a column in a partition expression. It will split on `.` and also supports back-ticks for quoting like normal column and table identifiers.
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