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https://issues.apache.org/jira/browse/DRILL-6099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351094#comment-16351094
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Aman Sinha commented on DRILL-6099:
-----------------------------------
[~gparai] I had couple of questions..sorry didn't get around to sending it
earlier.
> 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
> Labels: ready-to-commit
> Fix For: 1.13.0
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> 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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