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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