Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/948#issuecomment-45570350
@marmbrus @concretevitamin While working on the cache table SQL command and
reviewing PR #956, I think this PR may make both changes cleaner, so I tried to
finish this one first. For example, we won't need
[`processCmd`](https://github.com/apache/spark/pull/956/files#diff-ff50aea397a607b79df9bec6f2a841dbR255)
and
[`eagerlyProcess`](https://github.com/apache/spark/pull/956/files#diff-131c27c6a1f59770d738b11f2a4755ecR274)
anymore since all commands and insertions are eagerly executed in a unified
way.
Instead of `QueryExecution`, I factored the duplicated code into
`SchemaRDDLike` to make the change cleaner and more straightforward (after some
experiments, it turned out that moving code to `QueryExecution` complicates
things a lot).
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