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From "Phabricator (JIRA)" <>
Subject [jira] [Commented] (HIVE-4126) remove support for lead/lag UDFs outside of UDAF args
Date Thu, 07 Mar 2013 17:04:14 GMT


Phabricator commented on HIVE-4126:

ashutoshc has commented on the revision "HIVE-4126 [jira] remove support for lead/lag UDFs
outside of UDAF args".

  Changes look good. But following query in windowing_expressions.q fails
  select p_mfgr, p_retailprice, p_size,
  rank() as r,
   lag(rank(),1) as pr,
  sum(p_retailprice) as s2 over (rows between unbounded preceding and current row),
  sum(p_retailprice) - 5 as s1 over (rows between unbounded preceding and current row)
  from part
  distribute by p_mfgr
  sort by p_retailprice;

  Looks like need to update the query.

  ql/src/java/org/apache/hadoop/hive/ql/parse/ Do we need to update
this comment blocks. Function now does lot less than whats in comment. We probably need to
update comments of other functions as well.


To: JIRA, ashutoshc, hbutani

> remove support for lead/lag UDFs outside of UDAF args
> -----------------------------------------------------
>                 Key: HIVE-4126
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: PTF-Windowing
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: HIVE-4126.D9105.1.patch
> Select Expressions such as 
> p_size - lead(p_size,1)
> are currently handled as non aggregation expressions done after all over clauses are
> 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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