Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/5827#issuecomment-172144781
@rxin Our parser is a extended version of the `SqlParser`, the main
difference is that we add the support for subquery(both correlated and
uncorrelated ),exists, in and some minor improvement such as grouping, top,
cube/rollup. It support the tpcds generated ANSI sql syntax without any change.
I noticed that there are some PRs for these features, i will take a look at
that PRs when i have time and see what i can do.
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