Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16938
Based on [the
doc](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-CreateTableAsSelect(CTAS)),
Hive does not support CTAS when the target table is external.
**1. CREATE TABLE ... LOCATION path**
**2. CREATE TABLE ... LOCATION path AS SELECT ...**
When you testing the above two cases, you need to change the syntax a
little bit by manually adding `EXTERNAL`. Spark SQL actually is creating an
external table. This is different from Hive.
**1. CREATE EXTERNAL TABLE ... LOCATION path**
**2. CREATE EXTERNAL TABLE ... LOCATION path AS SELECT ...**
Could you update the comparison? Thanks!
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