Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/15073
  
    Based on my understanding, we are consolidating the write path, including 
providing a unified CREATE TABLE interface for both Hive serde tables and data 
source tables. So far, this feature is not ready. More ongoing works are needed 
before we can turn it on. If we do not block it, many bugs exist, since the 
interface (e.g, SQL, DataFrameWriter APIs, and createExternalTable APIs),  DDL 
execution and metastore formats are still different. 
    
    Thus, blocking the `hive` format is needed until we can officially support 
it. Let me know if my understanding is not right. cc @cloud-fan @yhuai 


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