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From "Pritesh Maker (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-6099) Drill does not push limit past project (flatten) if it cannot be pushed into scan
Date Fri, 23 Feb 2018 06:28:00 GMT

     [ https://issues.apache.org/jira/browse/DRILL-6099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pritesh Maker updated DRILL-6099:
---------------------------------
    Remaining Estimate:     (was: 48h)
     Original Estimate:     (was: 48h)

> Drill does not push limit past project (flatten) if it cannot be pushed into scan
> ---------------------------------------------------------------------------------
>
>                 Key: DRILL-6099
>                 URL: https://issues.apache.org/jira/browse/DRILL-6099
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.12.0
>            Reporter: Gautam Kumar Parai
>            Assignee: Gautam Kumar Parai
>            Priority: Major
>             Fix For: 1.13.0
>
>
> It would be useful to have pushdown occur past flatten(project). Here is an example to
illustrate the issue:
> {{explain plan without implementation for }}{{select name, flatten(categories) as category
from dfs.`/tmp/t_json_20` LIMIT 1;}}
> {{DrillScreenRel}}{{  }}
> {{  DrillLimitRel(fetch=[1])}}{{    }}
> {{    DrillProjectRel(name=[$0], category=[FLATTEN($1)])}}
> {{      DrillScanRel(table=[[dfs, /tmp/t_json_20]], groupscan=[EasyGroupScan [selectionRoot=maprfs:/tmp/t_json_20,
numFiles=1, columns=[`name`, `categories`], files=[maprfs:///tmp/t_json_20/0_0_0.json]]])}}
> ================================================================= 
> Content of 0_0_0.json
> =================================================================
> {
>   "name" : "Eric Goldberg, MD",
>   "categories" : [ "Doctors", "Health & Medical" ]
> } {
>   "name" : "Pine Cone Restaurant",
>   "categories" : [ "Restaurants" ]
> } {
>   "name" : "Deforest Family Restaurant",
>   "categories" : [ "American (Traditional)", "Restaurants" ]
> } {
>   "name" : "Culver's",
>   "categories" : [ "Food", "Ice Cream & Frozen Yogurt", "Fast Food", "Restaurants"
]
> } {
>   "name" : "Chang Jiang Chinese Kitchen",
>   "categories" : [ "Chinese", "Restaurants" ]
> } 
>  



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