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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5851) Empty table during a join operation with a non empty table produces cast exception
Date Mon, 15 Jan 2018 13:19:00 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16326219#comment-16326219
] 

ASF GitHub Bot commented on DRILL-5851:
---------------------------------------

Github user vdiravka commented on a diff in the pull request:

    https://github.com/apache/drill/pull/1059#discussion_r161512862
  
    --- Diff: exec/java-exec/src/test/java/org/apache/drill/exec/physical/impl/join/TestHashJoinAdvanced.java
---
    @@ -160,4 +165,19 @@ public void testJoinWithMapAndDotField() throws Exception {
           .baselineValues("1", "2", "1", null, "a")
           .go();
       }
    +
    +  @Test
    +  public void testHashLeftJoinWithEmptyTable() throws Exception {
    +    TestNestedLoopJoin.testWithEmptyJoin(dirTestWatcher.getRootDir(), "left outer", hjpattern,
1155L);
    --- End diff --
    
    It is not so good to use helper methods from `TestNestedLoopJoin` in `TestHashJoinAdvanced`
class. 
    Could you factor out the common part of code (helper methods and constants) into the Base
class, for example `JoinTestBase`?


> 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
>            Priority: Major
>              Labels: ready-to-commit
>
> 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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