Hi @roshanbi , We can confirm you that the type of Kudu's column cannot be changed after it is created.   One is that in the Known issue of document [1], the following information is explained. Non-alterable Column Types Kudu does not allow the type of a column to be altered. The second is that in the Impala documentation, there is no description that you can change the field type of Kudu. [1].  https://kudu.apache.org/docs/schema_design.html#known-limitations   After your review you can accept this as a solution and it helps others who are looking for the same.   Thank you, Chethan YM ... View more

Thanks for your reply @ChethanYM ,   But it's not work..   My colleague have find the solution , it's another key to modify:   hive.server2.parallel.ops.in.session = true   Michael ... View more