[jira] [Updated] (PHOENIX-943) Handle pushed down post-filters for subquery in joins with limit and non-groupby aggregation

["Maryann Xue (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PHOENIX-943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maryann Xue updated PHOENIX-943:
--------------------------------
    Attachment: 943.patch

In join queries, independent filter conditions (as opposed to cross-table filter conditions) from WHERE clause of ON clause are pushed down to corresponding join tables as pre-filter conditions when applicable (certain restrictions apply to left/right outer joins). 
If a join table is a sub-query (derived table), pushed-down pre-filters will finally get combined and rewritten into the sub-query itself. But in some rare cases like when the sub-query has a limit or the sub-query is a non-group-by aggregate query, the rewrite approach would not work, so we do client-side or server-side post filter on the sub-query result.

> Handle pushed down post-filters for subquery in joins with limit and non-groupby aggregation
> --------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-943
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-943
>             Project: Phoenix
>          Issue Type: Sub-task
>    Affects Versions: 3.0.0, 4.0.0, 5.0.0
>            Reporter: Maryann Xue
>            Assignee: Maryann Xue
>            Priority: Minor
>             Fix For: 3.0.0, 4.0.0, 5.0.0
>
>         Attachments: 943.patch
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> Support cases like:
> 1) select ... from A join (select id, b from T limit 10) as B on A.id = B.id where B.b = 'b'
> 2) select ... from A join (select count(*) c from T) as B on A.a = B.c where B.c > 10
> These 2 cases cannot be handled by SubselectRewriter#applyPostFilters(), thus JoinCompiler should compile post-filters into query-plans for subqueries.



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