drill-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Chun Chang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-1401) join on csv files does not work
Date Wed, 10 Sep 2014 23:43:33 GMT

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

Chun Chang updated DRILL-1401:
------------------------------
    Attachment: aggregate_100r.csv

The csv file used in the query. The other file (join_100r.csv) is a duplicate of the same
file.

> join on csv files does not work
> -------------------------------
>
>                 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
>         Attachments: 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          |



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

Mime
View raw message