[jira] [Commented] (DRILL-1649) JSON : Joining 2 sub-queries (one of them uses flatten) fails with "Hash Join doe not support schema changes"

["Jacques Nadeau (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-1649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205915#comment-14205915 ] 

Jacques Nadeau commented on DRILL-1649:
---------------------------------------

Logical Plan 

{code}
DrillScreenRel
  DrillProjectRel(uid=[$2], trans_id=[$0], EXPR$2=[ITEM($3, 'evnt_id')])
    DrillJoinRel(condition=[=($1, $4)], joinType=[inner])
      DrillAggregateRel(group=[{0}], max_event_time=[MAX($1)])
        DrillProjectRel(trans_id=[ITEM($2, 'trans_id')], $f1=[ITEM($1, 'event_time')])
          DrillFilterRel(condition=[>=(ITEM($2, 'trans_time'), ITEM($1, 'event_time'))])
            DrillProjectRel(uid=[$1], event=[FLATTEN($0)], transaction=[FLATTEN($2)])
              DrillScanRel(table=[[cp, /flatten/single-user-transactions.json]], groupscan=[EasyGroupScan [selectionRoot=/flatten/single-user-transactions.json, numFiles=1, columns = [SchemaPath [`uid`], SchemaPath [`events`], SchemaPath [`transactions`]]]])
      DrillProjectRel(uid=[$0], event=[$1], $f2=[ITEM($1, 'event_time')])
        DrillProjectRel(uid=[$1], event=[FLATTEN($0)])
          DrillScanRel(table=[[cp, /flatten/single-user-transactions.json]], groupscan=[EasyGroupScan [selectionRoot=/flatten/single-user-transactions.json, numFiles=1, columns = [SchemaPath [`uid`], SchemaPath [`events`]]]])
{code}

> JSON : Joining 2 sub-queries (one of them uses flatten) fails with "Hash Join doe not support schema changes" 
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-1649
>                 URL: https://issues.apache.org/jira/browse/DRILL-1649
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Functions - Drill, Storage - JSON
>            Reporter: Rahul Challapalli
>         Attachments: error.log, single-user-transactions.json
>
>
> git.commit.id.abbrev=60aa446
> I am running this test against Jason's branch which has some fixes to a few flatten issues.  
> The below query fails 
> {code}
> select event_info.uid, transaction_info.trans_id, event_info.event.evnt_id
> from (
>  select userinfo.transaction.trans_id trans_id, max(userinfo.event.event_time) max_event_time
>  from (
>      select uid, flatten(events) event, flatten(transactions) transaction from `json_kvgenflatten/single-user-transactions.json`
>  ) userinfo
>  where userinfo.transaction.trans_time >= userinfo.event.event_time
>  group by userinfo.transaction.trans_id
> ) transaction_info
> inner join
> (
>  select uid, flatten(events) event
>  from `json_kvgenflatten/single-user-transactions.json`
> ) event_info
> on transaction_info.max_event_time = event_info.event.event_time;
> {code}
> The problem still persists even if I create views on top of each sub-query and the join them
> {code}
> create view v1 as 
> select userinfo.transaction.trans_id trans_id, max(userinfo.event.event_time) max_event_time
>  from (
>      select uid, flatten(events) event, flatten(transactions) transaction from `json_kvgenflatten/single-user-transactions.json`
>  ) userinfo 
>  where userinfo.transaction.trans_time >= userinfo.event.event_time 
>  group by userinfo.transaction.trans_id;
>  
> create view v2 as select uid, flatten(events) event
>  from `json_kvgenflatten/single-user-transactions.json`;
>  
> select v2.uid, v1.trans_id, v2.event.evnt_id
> from v1 inner join v2 
> on v1.max_event_time = v2.event.event_time;
> {code}
> However if I create 2 files with the exact data from the outputs of the 2 sub-queries and try to join them the everything works fine.
> I attached the data, and the error log files. Let me know if you need anything



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)