Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/13886
CREATE TABLE AS SELECT can be converted to Create Data Source Table when
the following condition is true: `the statement does not have the
user-specified file format and row format`. (Actually, when the file format is
`Parquet`, we still can convert it. Will try to submit a PR for this case)
However, the default value of internal Conf `spark.sql.hive.convertCTAS` is
`false`. Thus, we do not convert them even if it is possible. Maybe we can add
a rule to do it when users do not enable Hive support?
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