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From Aman Sinha <amansi...@gmail.com>
Subject Re: Nested Window Queries
Date Thu, 03 Jan 2019 18:37:46 GMT
John,   what's the full SQL query that you submitted ?

On Thu, Jan 3, 2019 at 6:45 AM John Omernik <john@omernik.com> wrote:

> Is there a limitation on nesting of of Window Queries?  I have a query
> where I am using an event stream, and the changing of a value to indicate
> an event. (The state goes from disconnected, to charging, to complete, it
> reports many times in each of those states, but I am using lag(state, 1)
> over (order by event_ts) to find those records where current record is say
> complete and previous record was charging to indicate that the state has
> changed.
> This works well.
> Now I am trying to take that result set, and do another window to find the
> delta time between when the charging started and when the charging
> completed, you would think that a nested query showing the state change
> times, and then a select lag(event_ts, 1) over (order by event_ts) would be
> able to get me both the current time (when the charging was complete) and
> the previous record event_ts (when the charging started as outputted by the
> subquery). However, I am getting a verbose confusing error that perhaps we
> can help figure out...
> The first part is:
> SYSTEM ERROR: CannotPlanException: Node
> [rel#92358:Subset#11.LOGICAL.ANY([]).[3]] could not be implemented;
> planner state:
> Root: rel#92358:Subset#11.LOGICAL.ANY([]).[3]
> Original rel:
> The rest is pages of information related to the query, the data etc. I
> can send that separately if you are interested.
> I guess, before sending all of that, are nested window queries just
> not alloweable?
> If that is the case, what are some alternative approaches?
> Thanks,
> John

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