Harish Butani created HIVE-4126:
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Summary: remove support for lead/lag UDFs outside of UDAF args
Key: HIVE-4126
URL: https://issues.apache.org/jira/browse/HIVE-4126
Project: Hive
Issue Type: Bug
Components: PTF-Windowing
Reporter: Harish Butani
Assignee: Harish Butani
Select Expressions such as
p_size - lead(p_size,1)
are currently handled as non aggregation expressions done after all over
clauses are evaluated.
Once we allow different partitions in a single select list(Jira 4041), these
become ambiguous.
- the equivalent way to do such things is either to use lead/lag UDAFs with
expressions ( support added with Jira 4081)
- stack windowing clauses with inline queries. select lead(r,1).. from (select
rank() as r....)...
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