default boolean directInsert() {
    return false;
  }
Check if CTAS and CMV operations should behave in a direct-insert manner (i.e. no move task).
<p>
Please note that the atomicity of the operation will suffer in this case, i.e. the created table might become
exposed, depending on the implementation, before the CTAS or CMV operations finishes.
Rollback (e.g. dropping the table) is also the responsibility of the storage handler in case of failures.

@return whether direct insert CTAS or CMV is required
ql/src/java/org/apache/hadoop/hive/ql/metadata/HiveStorageHandler.java