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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-1401) Wrong result with csv data when projecting columns not part of the Join or Filter
Date Fri, 12 Sep 2014 16:46:34 GMT

     [ https://issues.apache.org/jira/browse/DRILL-1401?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jacques Nadeau updated DRILL-1401:
----------------------------------
    Fix Version/s: 0.6.0

> Wrong result with csv data when projecting columns not part of the Join or Filter
> ---------------------------------------------------------------------------------
>
>                 Key: DRILL-1401
>                 URL: https://issues.apache.org/jira/browse/DRILL-1401
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 0.5.0
>            Reporter: Chun Chang
>            Assignee: DrillCommitter
>             Fix For: 0.6.0
>
>         Attachments: 0001-DRILL-1401-Disable-projection-pushdown-for-text-form.patch,
aggregate_100r.csv
>
>
> #Wed Sep 10 13:35:05 PDT 2014
> git.commit.id.abbrev=686eb9e
> join (inner,full outer,left,right) does not work if the join is directly applied to csv
files. It will produce either null values on the projected columns or NumberFormatException
depends on joining condition applied on which columns (first or second columns). If you create
views on the csv files, then join works on the views.
> For example, the following join give null values:
> 0: jdbc:drill:schema=dfs> select cast(`aggregate_100r.csv`.columns[0] as int), cast(`aggregate_100r.csv`.columns[1]
as int), cast(`join_100r.csv`.columns[1] as int) from `aggregate_100r.csv` inner join `join_100r.csv`
on cast(`aggregate_100r.csv`.columns[0] as int) = cast(`join_100r.csv`.columns[0] as int);
> +------------+------------+------------+
> |   EXPR$0   |   EXPR$1   |   EXPR$2   |
> +------------+------------+------------+
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 0          | null       | null       |
> | 1          | null       | null       |
> | 1          | null       | null       |
> | 1          | null       | null       |
> | 1          | null       | null       |
> The following give NumberFormatException:
> 0: jdbc:drill:schema=dfs> select cast(`aggregate_100r.csv`.columns[0] as int), cast(`aggregate_100r.csv`.columns[1]
as int), cast(`join_100r.csv`.columns[1] as int) from `aggregate_100r.csv` inner join `join_100r.csv`
on cast(`aggregate_100r.csv`.columns[1] as int) = cast(`join_100r.csv`.columns[1] as int);
> Query failed: Failure while running fragment.  [3f67299e-f312-445b-8d6b-74984a820f0c]
> Error: exception while executing query: Failure while trying to get next result batch.
(state=,code=0)
> The following with views works:
> 0: jdbc:drill:schema=dfs> select `aggregate_100r_v`.c0, `aggregate_100r_v`.c1, `join_100r_v`.c1
from `aggregate_100r_v` inner join `join_100r_v` on `aggregate_100r_v`.c0 = `join_100r_v`.c0;
> +------------+------------+------------+
> |     c0     |     c1     |    c10     |
> +------------+------------+------------+
> | 0          | 0          | 0          |
> | 0          | 0          | 2          |
> | 0          | 0          | 1          |
> | 0          | 0          | 0          |
> | 0          | 0          | 0          |
> | 0          | 0          | 2          |
> | 0          | 0          | 1          |
> | 0          | 0          | 0          |
> | 0          | 1          | 0          |
> | 0          | 1          | 2          |
> | 0          | 1          | 1          |
> | 0          | 1          | 0          |
> | 0          | 2          | 0          |
> | 0          | 2          | 2          |
> | 0          | 2          | 1          |
> | 0          | 2          | 0          |
> | 1          | 1          | 1          |
> | 1          | 1          | 2          |
> | 1          | 1          | 1          |
> | 1          | 1          | 0          |



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