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https://issues.apache.org/jira/browse/DRILL-5851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16273782#comment-16273782
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ASF GitHub Bot commented on DRILL-5851:
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GitHub user HanumathRao opened a pull request:
https://github.com/apache/drill/pull/1059
DRILL-5851: Empty table during a join operation with a non empty tabl…
…e produces cast exception.
These code changes handle the cases where either of the table in a join is
empty and we do not need to process the join further. @paul-rogers
@amansinha100 Please review these changes.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HanumathRao/drill DRILL-5851-lat
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/1059.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1059
----
commit dbdffa51b802ae6c799264836ad86cc39d34fee2
Author: Hanumath Maduri <[email protected]>
Date: 2017-10-09T20:08:13Z
DRILL-5851: Empty table during a join operation with a non empty table
produces cast exception.
----
> Empty table during a join operation with a non empty table produces cast
> exception
> -----------------------------------------------------------------------------------
>
> Key: DRILL-5851
> URL: https://issues.apache.org/jira/browse/DRILL-5851
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Affects Versions: 1.11.0
> Reporter: Hanumath Rao Maduri
> Assignee: Hanumath Rao Maduri
>
> Hash Join operation on tables with one table empty and the other non empty
> throws an exception
> {code}
> Error: SYSTEM ERROR: DrillRuntimeException: Join only supports implicit casts
> between 1. Numeric data
> 2. Varchar, Varbinary data 3. Date, Timestamp data Left type: VARCHAR, Right
> type: INT. Add explicit casts to avoid this error
> {code}
> Here is an example query with which it is reproducible.
> {code}
> select * from cp.`sample-data/nation.parquet` nation left outer join
> dfs.tmp.`2.csv` as two on two.a = nation.`N_COMMENT`;
> {code}
> the contents of 2.csv is empty (i.e not even header info).
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