Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/7465#issuecomment-122658584
@mengxr I guess what we need here is essentially a wrapper helper function
which wraps a `DataFrame => DataFrame` function as a transformer, and a SQL
statement is just a (questionably) more convenient way to express this
function. One of the benefit of DataFrame DSL over SQL is that you don't need a
temporary table name.
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