Kunal Khatua updated DRILL-1328:
    Reviewer: Krystal

> Support table statistics
> ------------------------
>                 Key: DRILL-1328
>                 URL: https://issues.apache.org/jira/browse/DRILL-1328
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Cliff Buchanan
>            Assignee: Gautam Kumar Parai
>             Fix For: Future
>         Attachments: 0001-PRE-Set-value-count-in-splitAndTransfer.patch
> This consists of several subtasks
> * implement operators to generate statistics
> * add "analyze table" support to parser/planner
> * create a metadata provider to allow statistics to be used by optiq in 
> planning optimization
> * implement statistics functions
> Right now, the bulk of this functionality is implemented, but it hasn't been 
> rigorously tested and needs to have some definite answers for some of the 
> parts "around the edges" (how analyze table figures out where the table 
> statistics are located, how a table "append" should work in a read only file 
> system)
> Also, here are a few known caveats:
> * table statistics are collected by creating a sql query based on the string 
> path of the table. This should probably be done with a Table reference.
> * Case sensitivity for column statistics is probably iffy
> * Math for combining two column NDVs into a joint NDV should be checked.
> * Schema changes aren't really being considered yet.
> * adding getDrillTable is probably unnecessary; it might be better to do 
> getTable().unwrap(DrillTable.class)

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