Github user guowei2 commented on the pull request:
https://github.com/apache/spark/pull/2953#issuecomment-60553573
aims of step1 ( this pr):
1ãsupport parse sql with complex window define
2ãsupport most of aggregate-functions with window-spec
3ãsupport window range
aims of step2:
support the rest of un-support features as below:
1. not support with multi-different window partitions ,but support with
multi-same window partitions
2. not support with both window partition and group by
3. not support lead, lag (default lead and lag function lookup in
HiveFunctionRegistry are GenericUDF, we need GenericUDAF)
4. not support rank, dense_rank
3. not support sql parse with TOK_PTBLFUNCTION
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