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From "Hanifi Gunes (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3577) Counting nested fields on CTAS-created-parquet file/s reports inaccurate results
Date Wed, 29 Jul 2015 15:58:04 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14646311#comment-14646311
] 

Hanifi Gunes commented on DRILL-3577:
-------------------------------------

Discovered while trying to re-produce DRILL-3551.

> Counting nested fields on CTAS-created-parquet file/s reports inaccurate results
> --------------------------------------------------------------------------------
>
>                 Key: DRILL-3577
>                 URL: https://issues.apache.org/jira/browse/DRILL-3577
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Functions - Drill
>    Affects Versions: 1.1.0
>            Reporter: Hanifi Gunes
>            Assignee: Mehant Baid
>            Priority: Critical
>
> I have not tried this at a smaller scale nor on JSON file directly but the following
seems to re-prod the issue
> 1. Create an input file as follows
> 20K rows with the following - 
> {"some":"yes","others":{"other":"true","all":"false","sometimes":"yes"}}
> 200 rows with the following - 
> {"some":"yes","others":{"other":"true","all":"false","sometimes":"yes","additional":"last
> entries only"}}
> 2. CTAS as follows
> {code:sql}
> CREATE TABLE dfs.`tmp`.`tp` as select * from dfs.`data.json` t
> {code}
> This should read
> {code}
> Fragment Number of records written
> 0_0	20200
> {code}
> 3. Count on nested fields via
> {code:sql}
> select count(t.others.additional) from dfs.`tmp`.`tp` t
> OR
> select count(t.others.other) from dfs.`tmp`.`tp` t
> {code}
> reports no rows as follows
> {code}
> EXPR$0
> 0
> {code}
> While
> {code:sql}
> select count(t.`some`) from dfs.`tmp`.`tp` t where t.others.additional is not null
> {code}
> reports expected 200 rows
> {code}
> EXPR$0
> 200
> {code}



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