dbtsai commented on issue #26929: [SPARK-30289][SQL] DSv2's partitioning should 
not accept nested columns
URL: https://github.com/apache/spark/pull/26929#issuecomment-573950500
 
 
   I was on paternity leave, and sorry for the late reply.
   
   @rdblue the intent of this was to disable partition by nested columns 
because I saw some inconsistencies in the v2 codebase when I tried to create a 
new v2 filter api, and I thought partition by nested columns is not supported 
at all.
   
   For example, in `org.apache.spark.sql.catalyst.catalog.CatalogTable`, we 
have `partitionColumnNames: Seq[String]` as partition columns instead of using 
`NamedReference`, how do we properly support using nested column as 
partitioning? Are we paring the string that contains `.` as a nested column? 
Can you give me an example?
   
   @cloud-fan do you mean fix `InMemoryTable` so it supports it properly?

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