Re: [PR] HIVE-28935: Iceberg: fix partition hashing method to avoid collisions. [hive]

["difin (via GitHub)" <gi...@apache.org>]

difin commented on PR #5792:
URL: https://github.com/apache/hive/pull/5792#issuecomment-2840498605

   @okumin @deniskuzZ 
   
   This works except for one case and I’m not sure how we can do it.
   
   The case where it doesn't work:
   
   Let’s say you have a table with partition evolution and the partition specs are:
   ```
   Spec_Id, Partition Schema
   0, {field_a: String}
   1,. {field_a: String, b: String}
   ```
   
   And let’s say there are 2 partitions on disk:
   ```
   {a=NULL}
   {a=NULL, b=NULL}
   
   ```
   
   When calculating partition hash, we pass Iceberg partition struct, which contain fields from all partition specs, so we send these inputs to computeHash methods for the 2 different partitions:
   ```
   {a=NULL, b=NULL}
   {a=NULL, b=NULL}
   ```
   and the partition hash becomes the same for both partitions..


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