Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/12872#issuecomment-216733049
One thing that we've decided offline is that we should deprecate
Dataset.registerTempTable() by Dataset.createTempView() in a follow-up PR. It's
becoming confusing that we call the same thing "table" in Dataset API but
"view" in SQL DDL.
I think the essential difference between a view and a table is that a view
is basically a lineage, while a table is always materialized to disk. For
example, data of temporary tables in Hive are written to scratch folder of the
current session.
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