[GitHub] spark pull request: [SPARK-14507] [SQL] EXTERNAL keyword in a CTAS statement...

[gatorsmile <gi...@git.apache.org>]

Github user gatorsmile commented on the pull request:

    https://github.com/apache/spark/pull/13395
  
    Just realized you are working on all the restrictions of CTAS. Based on the [official document of Hive](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-CreateTableAsSelect(CTAS)), CTAS has three restrictions:
    - The target table cannot be a partitioned table.
    - The target table cannot be an external table.
    - The target table cannot be a list bucketing table.
    
    I have two test cases you can put in `DDLCommandSuite`:
    ```scala
      test("CTAS - PARTITIONED BY is not supported") {
        assertUnsupported(
          sql = "CREATE TABLE my_tab(a double, b double) PARTITIONED BY (a STRING) " +
            "AS SELECT key, value FROM mytable1")
      }
    
      test("CTAS - Bucketing is not supported") {
        assertUnsupported(
          sql = "CREATE TABLE my_tab(a double, b double) " +
            "CLUSTERED BY (a) SORTED BY (b) INTO 5 BUCKETS AS SELECT key, value FROM mytable1")
      }
    ```


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